InnoDB: Do not distinguish explicitly requested table locks.
Since UNLOCK TABLES will commit the transaction (and thus release all InnoDB locks held by it), it is unnecessary to release the user-requested table locks separately. innobase/include/lock0lock.h: Remove references to LOCK_TABLE_EXP and LOCK_TABLE_TRANSACTIONAL. Remove lock_release_tables_off_kernel(). innobase/include/row0mysql.h: Remove row_unlock_tables_for_mysql(). innobase/include/trx0trx.h: Remove n_lock_table_exp and n_lock_table_transactional. innobase/lock/lock0lock.c: Remove references to LOCK_TABLE_EXP and LOCK_TABLE_TRANSACTIONAL. Remove lock_release_tables_off_kernel(). Remove references to trx->n_lock_table_exp and trx->n_lock_table_transactional. innobase/row/row0mysql.c: Remove row_unlock_tables_for_mysql(). Remove references to LOCK_TABLE_TRANSACTIONAL and LOCK_TABLE_EXP. innobase/trx/trx0trx.c: Remove n_lock_table_exp and n_lock_table_transactional. sql/ha_innodb.cc: Remove references to LOCK_TABLE_EXP and LOCK_TABLE_TRANSACTIONAL and row_unlock_tables_for_mysql().
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