Fixed complex gcc assembler issues with 64-bit operations on 32-bit platforms using PIC codes, commented x86-gcc.h a lot more

Fixed an issue where STOP SLAVE generated a warning to error log which test case couldn't handle, fixed by checking for io slave killed before checking for network error

WL#3951 - MyISAM: Additional Error Logs for Data Corruption
Fixed partition_repair_myisam.test.

mysql-test/suite/parts/t/partition_repair_myisam.test:
  Suppress some extra warnings produced by MyISAM.

Bug#35591 FLUSH PRIVILEGES caused a crash

A race condition on the privilege hash tables (proc_priv_hash
and func_priv_hash) caused one thread to try to delete elements
that had already been deleted by another thread.

The bug was caused by reading and saving the pointers to 
the hash tables outside mutex protection.  This led to an
inconsistency where a thread copied a pointer to a hash,
another thread did the same, the first thread then deleted
the hash, and the second then crashed when it in turn tried to
delete the deleted hash.

The fix is to ensure that operations on the shared hash structures
happens under mutex protection (moving the locking up a little)

Implemented a new INFORMATION_SCHEMA table, which is intended to
provide information about tablespaces.

mysql-test/r/information_schema.result:
  Updated test result according to WL#2511. With this WL
  I_S has new TABLESPACES schema.
mysql-test/r/information_schema_db.result:
  Updated test result according to WL#2511. With this WL
  I_S has new TABLESPACES schema.
mysql-test/r/mysqlshow.result:
  Updated test result according to WL#2511. With this WL
  I_S has new TABLESPACES schema.
mysql-test/suite/funcs_1/r/is_columns_is.result:
  Updated test result according to WL#2511. With this WL
  I_S has new TABLESPACES schema.
mysql-test/suite/funcs_1/r/is_tables_is.result:
  Updated test result according to WL#2511. With this WL
  I_S has new TABLESPACES schema.
sql/handler.h:
  Added SCH_TABLESPACES to enum_schema_tables.
sql/mysql_priv.h:
  Added human readable definitions for I_S.TABLESPACES field
  identifiers.
sql/sql_show.cc:
  Added I_S.TABLESPACES schema. The code which handles I_S.FILES
  is capable to handle I_S.TABLESPACES as well. Thus we reuse
  this code and let functions/variables have more generic names.

The problem is not actually related to 2byte collation IDs.
The same crash happens if you change the collation ID in
mysql-test/str_data/Index.xml to a value smaller than 256.

Crash happened in SQL parser, because the "ident_map" and "state_map"
arrays were not initialized in loadable utf8 collations.

Fix: adding proper initialization of the "ident_map" and "state_map"
members for loadable utf8 collations.

Part II, engines instrumentation

plugin/semisync/CMakeLists.txt:
  Add mysqlservices to link libraries
plugin/semisync/Makefile.am:
  Add mysqlservices to link libraries

Added back n_frees, use 'clear' instead of 'free' since memory is
not freed here.


plugin/semisync/semisync_master.cc:
  Added back n_frees, use 'clear' instead of 'free' in the message since memory is not freed here.

Before this patch, semisync assumed transactions running in parallel
can not be larger than max_connections, but this is not true when
the event scheduler is executing events, and cause semisync run out
of preallocated transaction nodes.

Fix the problem by allocating transaction nodes dynamically.

This patch also fixed a possible deadlock when running UNINSTALL
PLUGIN rpl_semi_sync_master and updating in parallel. Fixed by
releasing the internal Delegate lock before unlock the plugins.

mysql-test/suite/rpl/t/rpl_semi_sync_event.test:
  Add test case for bug#49020
plugin/semisync/semisync_master.cc:
  Allocating TranxNode dynamically
plugin/semisync/semisync_master.h:
  Allocating TranxNode dynamically
sql/rpl_handler.cc:
  Unlock plugins after we have released the Delegate lock to avoid possible deadlock when uninstalling semisync master plugin and doing update in parallel.