MDEV-4956 - Reduce usage of LOCK_open: TABLE_SHARE::tdc.used_tables
- tc_acquire_table and tc_release_table do not access TABLE_SHARE::tdc.used_tables anymore - in tc_acquire_table(): release LOCK_tdc after we relase LOCK_open (saves a few CPU cycles in critical section) - in tc_release_table(): if we reached table cache threshold, evict to-be-released table without moving it to unused_tables. unused_tables must be empty at this point.
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