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MDEV-28289 fts_optimize_sync_table() is acquiring dict_sys.latch whil…
…e holding it dict_acquire_mdl_shared(): Invoke the correct variant dict_table_t::parse_name<true>() also when trylock=true, that is, we are being called from fts_optimize_sync_table(). Ever since commit 82b7c56 (MDEV-24258) this code was prone to a hang. If another thread requested an exclusive dict_sys.latch between the time dict_acquire_mdl_shared<trylock=true>() acquired a shared dict_sys.latch and dict_table_t::parse_name<false>() was trying to acquire another shared dict_sys.latch, InnoDB would get into an infinite livelock of threads, because the futex-based srw-lock implementation prioritizes exclusive latch requests. dict_table_t::parse_name(): Rename the template parameter dict_locked into dict_frozen.
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