Preallocate binary logs

Registered by Laurynas Biveinis on 2012-06-14

Pre-allocating binary log files changes the binlog file append operation to a write operation with performance win for sync_binlog=1. More rationale and performance details are at https://forge.mysql.com/worklog/task.php?id=4925 and http://lists.mysql.com/commits/113309 .

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