Backport from 10.0:
MDEV-6450 - MariaDB crash on Power8 when built with advance tool chain InnoDB mutex_exit() function calls __sync_test_and_set() to release the lock. According to manual this function is supposed to create "acquire" memory barrier whereas in fact we need "release" memory barrier at mutex_exit(). The problem isn't repeatable with gcc because it creates "acquire-release" memory barrier for __sync_test_and_set(). ATC creates just "acquire" barrier. Fixed by creating proper barrier at mutex_exit() by using __sync_lock_release() instead of __sync_test_and_set().
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