branches/5.1: Merge r4922 from branches/zip.
This the fix for the first part of Bug #41609 from InnoDB Plugin to the built-in InnoDB in MySQL 5.1. This allows InnoDB Hot Backup to back up a database while the built-in InnoDB in MySQL 5.1 is creating temporary tables. (This fix does not address the printouts about missing .ibd files for temporary tables at InnoDB startup, which was committed to branches/zip in r6252.) rb://219 approved by Sunny Bains. branches/zip: Distinguish temporary tables in MLOG_FILE_CREATE. This addresses Mantis Issue #23 in InnoDB Hot Backup and some of MySQL Bug #41609. In MLOG_FILE_CREATE, we need to distinguish temporary tables, so that InnoDB Hot Backup can work correctly. It turns out that we can do this easily, by using a bit of the previously unused parameter for page number. (The page number parameter of MLOG_FILE_CREATE has been written as 0 ever since MySQL 4.1, which introduced MLOG_FILE_CREATE.) MLOG_FILE_FLAG_TEMP: A flag for indicating a temporary table in the page number parameter of MLOG_FILE_ operations. fil_op_write_log(): Add the parameter log_flags. fil_op_log_parse_or_replay(): Add the parameter log_flags. Do not replay MLOG_FILE_CREATE when MLOG_FILE_FLAG_TEMP is set in log_flags. This only affects ibbackup --apply-log. InnoDB itself never replays file operations.
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