Write the is_temp flag to SYS_TABLES.MIX_LEN.

dict_table_t::flags: Add a flag for is_temporary, DICT_TF2_TEMPORARY.
Unlike other flags, this will not be written to the tablespace flags
or SYS_TABLES.TYPE, but only to SYS_TABLES.MIX_LEN.

dict_build_table_def_step(): Only pass DICT_TF_BITS to tablespaces.

dict_check_tablespaces_and_store_max_id(), dict_load_table():
Suppress errors about temporary tables not being found.

dict_create_sys_tables_tuple(): Write the DICT_TF2_TEMPORARY flag
to SYS_TABLES.MIX_LEN.

fil_space_create(), fil_create_new_single_table_tablespace(): Add assertions
about space->flags.

row_drop_table_for_mysql(): Do not complain about non-found temporary tables.

rb://160 approved by Heikki Tuuri.  This addresses the second part of
Bug #41609 Crash recovery does not work for InnoDB temporary tables.

Whitespace fixup.

Add ChangeLog entry for c6207.

(r6203 was skipped as it is already in branches/zip)

  ------------------------------------------------------------------------
  r6200 | vasil | 2009-11-19 12:14:23 +0200 (Thu, 19 Nov 2009) | 4 lines
  Changed paths:
     M /branches/5.1/btr/btr0btr.c
  
  branches/5.1:
  
  White space fixup - indent under the opening (
  
  ------------------------------------------------------------------------
  r6203 | jyang | 2009-11-19 15:12:22 +0200 (Thu, 19 Nov 2009) | 8 lines
  Changed paths:
     M /branches/5.1/btr/btr0btr.c
  
  branches/5.1: Use btr_free_root() instead of fseg_free() for
  the fix of bug #48469, because fseg_free() is not defined
  in the zip branch. And we could save one mini-trasaction started
  by fseg_free().
  
  Approved by Marko.
  
  
  ------------------------------------------------------------------------
  r6205 | jyang | 2009-11-20 07:55:48 +0200 (Fri, 20 Nov 2009) | 11 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
  
  branches/5.1: Add a special case to handle the Duplicated Key error
  and return DB_ERROR instead. This is to avoid a possible SIGSEGV
  by mysql error handling re-entering the storage layer for dup key
  info without proper table handle.
  This is to prevent a server crash when error situation in bug
  #45961 "DDL on partitioned innodb tables leaves data dictionary
  in an inconsistent state" happens.
  
  rb://157 approved by Sunny Bains.
  
  
  ------------------------------------------------------------------------
  r6206 | jyang | 2009-11-20 09:38:43 +0200 (Fri, 20 Nov 2009) | 5 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
  
  branches/5.1: Fix a minor code formating issue for 
  the parenthesis iplacement of the if condition in
  rename_table().
  
  
  ------------------------------------------------------------------------

in branches/zip. To port fix for bug #48469 to zip,
we can use btr_free_root() which frees the page,
and also does not require mini-transaction.

Approved by Marko.

on orphaned tables when creating a primary key.

  ------------------------------------------------------------------------
  r6187 | jyang | 2009-11-18 05:27:30 +0200 (Wed, 18 Nov 2009) | 9 lines
  Changed paths:
     M /branches/5.1/btr/btr0btr.c
  
  branches/5.1: Fix bug #48469 "when innodb tablespace is
  configured too small, crash and corruption!". Function
  btr_create() did not check the return status of fseg_create(),
  and continue the index creation even there is no sufficient
  space.
  
  rb://205 Approved by Marko
  
  
  ------------------------------------------------------------------------
  r6188 | jyang | 2009-11-18 07:14:23 +0200 (Wed, 18 Nov 2009) | 8 lines
  Changed paths:
     M /branches/5.1/data/data0type.c
  
  branches/5.1: Fix bug #48526 "Data type for float and
  double is incorrectly reported in InnoDB table monitor".
  Certain datatypes are not printed correctly in
  dtype_print().
  
  rb://204 Approved by Marko.
  
  
  ------------------------------------------------------------------------

Add ChangeLog entry for r6197.

Due to MySQL changes to the CMake, it is no longer able
to build InnoDB plugin as a static library on Windows.
The fix is proposed by Vlad of MySQL.

Increment version number from 1.0.5 to 1.0.6 since 1.0.5 was just released
by MySQL and we will soon release 1.0.6.

and the table is being locked by another transaction,
do not attempt to drop the table. (Bug #48782)

Approved by Sunny Bains over IM

Add ChangeLog entry for r6185.

to the client connection, not to the error log.  This change will allow
innodb-index.test to be re-enabled.  It was previously disabled, because
mysql-test-run does not like output in the error log.

row_create_table_for_mysql(): Do not output anything to the error log
when reporting DB_DUPLICATE_KEY.  Let the caller report the error.
Add a TODO comment that the dict_table_t object is apparently not freed
when an error occurs.

create_table_def(): Convert InnoDB table names to the character set
of the client connection for reporting.  Use my_error(ER_WRONG_COLUMN_NAME)
for reporting reserved column names.  Report my_error(ER_TABLE_EXISTS_ERROR)
when row_create_table_for_mysql() returns DB_DUPLICATE_KEY.

rb://206

At the end of innodb-index.test: restore the environment as it was before
the test was started to silence this warning:

  MTR's internal check of the test case 'main.innodb-index' failed.
  This means that the test case does not preserve the state that existed
  before the test case was executed.  Most likely the test case did not
  do a proper clean-up.
  This is the diff of the states of the servers before and after the
  test case was executed:
  mysqltest: Logging to '/tmp/autotest.sh-20091117_033000-zip.btyZwu/mysql-5.1/mysql-test/var/tmp/check-mysqld_1.log'.
  mysqltest: Results saved in '/tmp/autotest.sh-20091117_033000-zip.btyZwu/mysql-5.1/mysql-test/var/tmp/check-mysqld_1.result'.
  mysqltest: Connecting to server localhost:13000 (socket /tmp/autotest.sh-20091117_033000-zip.btyZwu/mysql-5.1/mysql-test/var/tmp/mysqld.1.sock) as 'root', connection 'default', attempt 0 ...
  mysqltest: ... Connected.
  mysqltest: Start processing test commands from './include/check-testcase.test' ...
  mysqltest: ... Done processing test commands.
  --- /tmp/autotest.sh-20091117_033000-zip.btyZwu/mysql-5.1/mysql-test/var/tmp/check-mysqld_1.result	2009-11-17 13:10:40.000000000 +0300
  +++ /tmp/autotest.sh-20091117_033000-zip.btyZwu/mysql-5.1/mysql-test/var/tmp/check-mysqld_1.reject	2009-11-17 13:10:54.000000000 +0300
  @@ -84,7 +84,7 @@
   INNODB_DOUBLEWRITE	ON
   INNODB_FAST_SHUTDOWN	1
   INNODB_FILE_FORMAT	Antelope
  -INNODB_FILE_FORMAT_CHECK	Antelope
  +INNODB_FILE_FORMAT_CHECK	Barracuda
   INNODB_FILE_PER_TABLE	OFF
   INNODB_FLUSH_LOG_AT_TRX_COMMIT	1
   INNODB_FLUSH_METHOD	
  
  mysqltest: Result content mismatch
  
  not ok

missing, report it to the client, not to the error log.

Wrap line at 78th char in the ChangeLog

rb://183 approved by Heikki Tuuri

This crash is reproducible with InnoDB plugin 1.0.4 + MySQL 5.1.37.
But no longer reproducible after MySQL 5.1.38 (with plugin 1.0.5).
Add test case to catch future regression.

with older version of MySQL.

thd_binlog_filter_ok() is introduced in MySQL 5.1.41. But the
plugin can be built with MySQL prior to 5.1.41.

Approved by Heikki (on IM).

Add ChangeLog for r6157.

Add changelog entry for r6160.

(r6158 was skipped as an equivallent change has already been merged from MySQL)

  ------------------------------------------------------------------------
  r6154 | calvin | 2009-11-11 02:51:17 +0200 (Wed, 11 Nov 2009) | 17 lines
  Changed paths:
     M /branches/5.1/include/os0file.h
     M /branches/5.1/os/os0file.c
  
  branches/5.1: fix bug#3139: Mysql crashes: 'windows error 995'
  after several selects on a large DB
  
  During stress environment, Windows AIO may fail with error code
  ERROR_OPERATION_ABORTED. InnoDB does not handle the error, rather
  crashes. The cause of the error is unknown, but likely due to
  faulty hardware or driver.
  
  This patch introduces a new error code OS_FILE_OPERATION_ABORTED,
  which maps to Windows ERROR_OPERATION_ABORTED (995). When the error
  is detected during AIO, the InnoDB will issue a synchronous retry
  (read/write).
  
  This patch has been extensively tested by MySQL support.
  
  Approved by: Marko
  rb://196
  ------------------------------------------------------------------------
  r6158 | vasil | 2009-11-11 14:52:14 +0200 (Wed, 11 Nov 2009) | 37 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
     M /branches/5.1/handler/ha_innodb.h
  
  branches/5.1:
  
  Merge a change from MySQL:
  (this has been reviewed by Calvin and Marko, and Calvin says Luis has
  incorporated Marko's suggestions)
  
    ------------------------------------------------------------
    revno: 3092.5.1
    committer: Luis Soares <luis.soares@sun.com>
    branch nick: mysql-5.1-bugteam
    timestamp: Thu 2009-09-24 15:52:52 +0100
    message:
      BUG#42829: binlogging enabled for all schemas regardless of
      binlog-db-db / binlog-ignore-db
            
      InnoDB will return an error if statement based replication is used
      along with transaction isolation level READ-COMMITTED (or weaker),
      even if the statement in question is filtered out according to the
      binlog-do-db rules set. In this case, an error should not be printed.
            
      This patch addresses this issue by extending the existing check in
      external_lock to take into account the filter rules before deciding to
      print an error. Furthermore, it also changes decide_logging_format to
      take into consideration whether the statement is filtered out from 
      binlog before decision is made.
    added:
      mysql-test/suite/binlog/r/binlog_stm_do_db.result
      mysql-test/suite/binlog/t/binlog_stm_do_db-master.opt
      mysql-test/suite/binlog/t/binlog_stm_do_db.test
    modified:
      sql/sql_base.cc
      sql/sql_class.cc
      storage/innobase/handler/ha_innodb.cc
      storage/innobase/handler/ha_innodb.h
      storage/innodb_plugin/handler/ha_innodb.cc
      storage/innodb_plugin/handler/ha_innodb.h
  
  ------------------------------------------------------------------------

Merge a change from MySQL:
(this has been reviewed by Calvin and Marko, and Calvin says Luis has
incorporated Marko's suggestions)

  ------------------------------------------------------------
  revno: 3092.5.1
  committer: Luis Soares <luis.soares@sun.com>
  branch nick: mysql-5.1-bugteam
  timestamp: Thu 2009-09-24 15:52:52 +0100
  message:
    BUG#42829: binlogging enabled for all schemas regardless of
    binlog-db-db / binlog-ignore-db
          
    InnoDB will return an error if statement based replication is used
    along with transaction isolation level READ-COMMITTED (or weaker),
    even if the statement in question is filtered out according to the
    binlog-do-db rules set. In this case, an error should not be printed.
          
    This patch addresses this issue by extending the existing check in
    external_lock to take into account the filter rules before deciding to
    print an error. Furthermore, it also changes decide_logging_format to
    take into consideration whether the statement is filtered out from 
    binlog before decision is made.
  added:
    mysql-test/suite/binlog/r/binlog_stm_do_db.result
    mysql-test/suite/binlog/t/binlog_stm_do_db-master.opt
    mysql-test/suite/binlog/t/binlog_stm_do_db.test
  modified:
    sql/sql_base.cc
    sql/sql_class.cc
    storage/innobase/handler/ha_innodb.cc
    storage/innobase/handler/ha_innodb.h
    storage/innodb_plugin/handler/ha_innodb.cc
    storage/innodb_plugin/handler/ha_innodb.h

in innodb_file_format_check_validate() is being referenced
across function in innodb_file_format_check_update().
In addition, fix "set global innodb_file_format_check =
DEFAULT" call.
Bug #47167: "set global innodb_file_format_check" cannot
set value by User-Defined Variable."
rb://169 approved by Sunny Bains and Marko.

(everything except the last white-space change was skipped as it is already
in branches/zip)

  ------------------------------------------------------------------------
  r6127 | vasil | 2009-10-30 11:18:25 +0200 (Fri, 30 Oct 2009) | 18 lines
  Changed paths:
     M /branches/5.1/Makefile.am
     M /branches/5.1/mysql-test/innodb-autoinc.result
     M /branches/5.1/mysql-test/innodb-autoinc.test
  
  branches/5.1:
  
  Backport c6121 from branches/zip:
  
    ------------------------------------------------------------------------
    r6121 | sunny | 2009-10-30 01:42:11 +0200 (Fri, 30 Oct 2009) | 7 lines
    Changed paths:
       M /branches/zip/mysql-test/innodb-autoinc.result
    
    branches/zip: This test has been problematic for sometime now. The underlying
    bug is that the data dictionaries get out of sync. In the AUTOINC code we
    try and apply salve to the symptoms. In the past MySQL made some unrelated
    change and the dictionaries stopped getting out of sync and this test started
    to fail. Now, it seems they have reverted that changed and the test is
    passing again. I suspect this is not he last time that this test will change.
    
    ------------------------------------------------------------------------
  
  ------------------------------------------------------------------------
  r6129 | vasil | 2009-10-30 17:14:22 +0200 (Fri, 30 Oct 2009) | 4 lines
  Changed paths:
     M /branches/5.1/Makefile.am
  
  branches/5.1:
  
  Revert a change to Makefile.am that sneaked unnoticed in c6127.
  
  ------------------------------------------------------------------------
  r6136 | marko | 2009-11-04 12:28:10 +0200 (Wed, 04 Nov 2009) | 15 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
     M /branches/5.1/include/ha_prototypes.h
     M /branches/5.1/ut/ut0ut.c
  
  branches/5.1: Port r6134 from branches/zip:
  
    ------------------------------------------------------------------------
    r6134 | marko | 2009-11-04 07:57:29 +0000 (Wed, 04 Nov 2009) | 5 lines
  
    branches/zip: innobase_convert_identifier(): Convert table names with
    explain_filename() to address Bug #32430: 'show innodb status'
    causes errors Invalid (old?) table or database name in logs.
  
    rb://134 approved by Sunny Bains
    ------------------------------------------------------------------------
  
  innobase_print_identifier(): Replace with innobase_convert_name().
  
  innobase_convert_identifier(): New function, called by innobase_convert_name().
  ------------------------------------------------------------------------
  r6149 | vasil | 2009-11-09 11:15:01 +0200 (Mon, 09 Nov 2009) | 5 lines
  Changed paths:
     M /branches/5.1/CMakeLists.txt
  
  branches/5.1:
  
  Followup to r5700: Adjust the changes so they are the same as in the BZR
  repository.
  
  ------------------------------------------------------------------------
  r6150 | vasil | 2009-11-09 11:43:31 +0200 (Mon, 09 Nov 2009) | 58 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
  
  branches/5.1:
  
  Merge a part of r2911.5.5 from MySQL:
  (the other part of this was merged in c5700)
  
    ------------------------------------------------------------
    revno: 2911.5.5
    committer: Vladislav Vaintroub <vvaintroub@mysql.com>
    branch nick: 5.1-innodb_plugin
    timestamp: Wed 2009-06-10 10:59:49 +0200
    message:
      Backport WL#3653 to 5.1 to enable bundled innodb plugin.
      Remove custom DLL loader code from innodb plugin code, use 
      symbols exported from mysqld.
    removed:
      storage/innodb_plugin/handler/handler0vars.h
      storage/innodb_plugin/handler/win_delay_loader.cc
    added:
      storage/mysql_storage_engine.cmake
      win/create_def_file.js
    modified:
      CMakeLists.txt
      include/m_ctype.h
      include/my_global.h
      include/my_sys.h
      include/mysql/plugin.h
      libmysqld/CMakeLists.txt
      mysql-test/mysql-test-run.pl
      mysql-test/t/plugin.test
      mysql-test/t/plugin_load-master.opt
      mysys/charset.c
      sql/CMakeLists.txt
      sql/handler.h
      sql/mysql_priv.h
      sql/mysqld.cc
      sql/sql_class.cc
      sql/sql_class.h
      sql/sql_list.h
      sql/sql_profile.h
      storage/Makefile.am
      storage/archive/CMakeLists.txt
      storage/blackhole/CMakeLists.txt
      storage/csv/CMakeLists.txt
      storage/example/CMakeLists.txt
      storage/federated/CMakeLists.txt
      storage/heap/CMakeLists.txt
      storage/innobase/CMakeLists.txt
      storage/innobase/handler/ha_innodb.cc
      storage/innodb_plugin/CMakeLists.txt
      storage/innodb_plugin/handler/ha_innodb.cc
      storage/innodb_plugin/handler/handler0alter.cc
      storage/innodb_plugin/handler/i_s.cc
      storage/innodb_plugin/plug.in
      storage/myisam/CMakeLists.txt
      storage/myisammrg/CMakeLists.txt
      win/Makefile.am
      win/configure.js
  
  ------------------------------------------------------------------------
  r6152 | vasil | 2009-11-10 15:30:20 +0200 (Tue, 10 Nov 2009) | 4 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
  
  branches/5.1:
  
  White space fixup.
  
  ------------------------------------------------------------------------

explain_filename() to address Bug #32430: 'show innodb status'
causes errors Invalid (old?) table or database name in logs.

rb://134 approved by Sunny Bains

that Valgrind will not complain about freed data structures that are
reachable via pointers.  This addresses Bug #45992 and Bug #46656.

This patch is mostly based on changes copied from branches/embedded-1.0,
mainly c5432, c3439, c3134, c2994, c2978, but also some other code was
copied.  Some added cleanup code is specific to MySQL/InnoDB.

rb://199 approved by Sunny Bains

(skipping r6122 and r6123, Jimmy says these are already present and need
not be merged):

  ------------------------------------------------------------------------
  r6122 | jyang | 2009-10-30 05:18:38 +0200 (Fri, 30 Oct 2009) | 7 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
     M /branches/5.1/mysql-test/innodb_bug44369.result
     M /branches/5.1/mysql-test/innodb_bug44369.test
     M /branches/5.1/mysql-test/innodb_bug46000.result
     M /branches/5.1/mysql-test/innodb_bug46000.test
  
  branches/5.1: Chnage WARN_LEVEL_ERROR to WARN_LEVEL_WARN
  for push_warning_printf() call in innodb.
  Fix Bug#47233: Innodb calls push_warning(MYSQL_ERROR::WARN_LEVEL_ERROR)
  
  rb://170 approved by Marko.
  
  
  ------------------------------------------------------------------------
  r6123 | jyang | 2009-10-30 05:43:06 +0200 (Fri, 30 Oct 2009) | 8 lines
  Changed paths:
     M /branches/5.1/os/os0proc.c
  
  branches/5.1: In os_mem_alloc_large(), if we fail to attach
  the shared memory, reset memory pointer ptr to NULL, and
  allocate memory from conventional pool. This is a port
  from branches/zip.
  Bug #48237 Error handling in os_mem_alloc_large appears to be incorrect
  rb://198  Approved by: Marko
  
  
  ------------------------------------------------------------------------
  r6125 | vasil | 2009-10-30 10:31:23 +0200 (Fri, 30 Oct 2009) | 4 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
  
  branches/5.1:
  
  White-space fixup.
  
  ------------------------------------------------------------------------

from # 48273 to #48237

bug is that the data dictionaries get out of sync. In the AUTOINC code we
try and apply salve to the symptoms. In the past MySQL made some unrelated
change and the dictionaries stopped getting out of sync and this test started
to fail. Now, it seems they have reverted that changed and the test is
passing again. I suspect this is not he last time that this test will change.

* Add ChangeLog entries for latest changes
* Obey alphabetical order in the list of the files
* White-space fixup

(after this merge the innodb-autoinc test starts to fail, but
I commit anyway because it would be easier to investigate the
failure this way)

  ------------------------------------------------------------------------
  r5952 | calvin | 2009-09-22 19:45:07 +0300 (Tue, 22 Sep 2009) | 7 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
  
  branches/5.1: fix bug#42383: Can't create table 'test.bug39438'
  
  For embedded server, MySQL may pass in full path, which is
  currently disallowed. It is needed to relax the condition by
  accepting full paths in the embedded case.
  
  Approved by: Heikki (on IM)
  ------------------------------------------------------------------------
  r6032 | vasil | 2009-10-01 15:55:49 +0300 (Thu, 01 Oct 2009) | 8 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
  
  branches/5.1:
  
  Fix Bug#38996 Race condition in ANALYZE TABLE
  
  by serializing ANALYZE TABLE inside InnoDB.
  
  Approved by:	Heikki (rb://175)
  
  ------------------------------------------------------------------------
  r6045 | jyang | 2009-10-08 02:27:08 +0300 (Thu, 08 Oct 2009) | 7 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
     A /branches/5.1/mysql-test/innodb_bug47777.result
     A /branches/5.1/mysql-test/innodb_bug47777.test
  
  branches/5.1: Fix bug #47777. Treat the Geometry data same as
  Binary BLOB in ha_innobase::store_key_val_for_row(), since the
  Geometry data is stored as Binary BLOB in Innodb.
  
  Review: rb://180 approved by Marko Makela.
  
  
  ------------------------------------------------------------------------
  r6051 | sunny | 2009-10-12 07:05:00 +0300 (Mon, 12 Oct 2009) | 6 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
     M /branches/5.1/mysql-test/innodb-autoinc.result
     M /branches/5.1/mysql-test/innodb-autoinc.test
  
  branches/5.1: Ignore negative values supplied by the user when calculating the
  next value to store in dict_table_t. Setting autoincrement columns top negative
  values is undefined behavior and this change should bring the behavior of
  InnoDB closer to what users expect. Added several tests to check.
  rb://162
  
  ------------------------------------------------------------------------
  r6052 | sunny | 2009-10-12 07:09:56 +0300 (Mon, 12 Oct 2009) | 4 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
     M /branches/5.1/mysql-test/innodb-autoinc.result
     M /branches/5.1/mysql-test/innodb-autoinc.test
  
  branches/5.1: Reset the statement level autoinc counter on ROLLBACK. Fix
  the test results too.
  rb://164
  
  ------------------------------------------------------------------------
  r6053 | sunny | 2009-10-12 07:37:49 +0300 (Mon, 12 Oct 2009) | 6 lines
  Changed paths:
     M /branches/5.1/handler/ha_innodb.cc
     M /branches/5.1/mysql-test/innodb-autoinc.result
     M /branches/5.1/mysql-test/innodb-autoinc.test
  
  branches/5.1: Copy the maximum AUTOINC value from the old table to the new
  table when MySQL does a CREATE INDEX ON T. This is required because MySQL
  does a table copy, rename and drops the old table.
  Fix Bug#47125: auto_increment start value is ignored if an index is created and engine=innodb
  rb://168
  
  ------------------------------------------------------------------------
  r6076 | vasil | 2009-10-14 19:30:12 +0300 (Wed, 14 Oct 2009) | 4 lines
  Changed paths:
     M /branches/5.1/row/row0mysql.c
  
  branches/5.1:
  
  Fix typo.
  
  ------------------------------------------------------------------------

Proposed by MySQL, and approved by Marko.

This was reported as Issue #381.

buf_page_set_old(): Assert that blocks may only be set old if
buf_pool->LRU_old is initialized and buf_pool->LRU_old_len is nonzero.
Assert that buf_pool->LRU_old points to the block at the old/new boundary.

buf_LRU_old_adjust_len(): Invoke buf_page_set_old() after adjusting
buf_pool->LRU_old and buf_pool->LRU_old_len, in order not to violate
the added assertions.

buf_LRU_old_init(): Replace buf_page_set_old() with a direct
assignment to bpage->old, because these loops that initialize all the
blocks would temporarily violate the assertions about
buf_pool->LRU_old.

buf_LRU_remove_block(): When setting buf_pool->LRU_old = NULL, also
clear all bpage->old flags and set buf_pool->LRU_old_len = 0.

buf_LRU_add_block_to_end_low(), buf_LRU_add_block_low(): Move the
buf_page_set_old() call later in order not to violate the debug
assertions.  If buf_pool->LRU_old is NULL, set old=FALSE.

buf_LRU_free_block(): Replace the UNIV_LRU_DEBUG assertion with a
dummy buf_page_set_old() call that performs more thorough checks.

buf_LRU_validate(): Do not tolerate garbage in buf_pool->LRU_old_len
even if buf_pool->LRU_old is NULL.  Check that bpage->old is monotonic.

buf_relocate(): Make the UNIV_LRU_DEBUG checks stricter.

buf0buf.h: Revise the documentation of buf_page_t::old and
buf_pool_t::LRU_old_len.