Remove unnecessary pointer indirection for rw_lock_t

In MySQL 5.7.8 an extra level of pointer indirection was added to
dict_operation_lock and some other rw_lock_t without solid justification,
in mysql/mysql-server@52720f1772f9f424bf3dd62fa9c214dd608cd036.

Let us revert that change and remove the rather useless rw_lock_t
constructor and destructor and the magic_n field. In this way,
some unnecessary pointer dereferences and heap allocation will be avoided
and debugging might be a little easier.

0 files changed, 0 insertions, 0 deletions