innobase/lock/lock0lock.c:
Made change where lock on the supremum record is really a 'gap' type lock and
gap type lock do not need to wait if it is not LOCK_INSERT_INTENSION type.
innobase/row/row0ins.c:
Added fuction row_ins_set_exclusive_rec_lock to set exclusive lock on a record.
This function is used for locking possible duplicate key records when
user has issued REPLACE-command.
Because manual defines the REPLACE semantics that it is either an INSERT or
DELETE(s) for duplicate key + INSERT, we take X-lock directly for duplicate
records to avoid unnecessary lock upgrades and deadlocks caused by lock
upgrades.
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