cleanup: remove unused THD::COND_wsrep_thd

sql/sql_class.cc

@@ -1034,7 +1034,6 @@ THD::THD(bool is_wsrep_applier)
 
 #ifdef WITH_WSREP
   mysql_mutex_init(key_LOCK_wsrep_thd, &LOCK_wsrep_thd, MY_MUTEX_INIT_FAST);
-  mysql_cond_init(key_COND_wsrep_thd, &COND_wsrep_thd, NULL);
   wsrep_ws_handle.trx_id = WSREP_UNDEFINED_TRX_ID;
   wsrep_ws_handle.opaque = NULL;
   wsrep_retry_counter     = 0;

sql/sql_class.h

@@ -3788,7 +3788,6 @@ public:
   enum wsrep_query_state    wsrep_query_state;
   enum wsrep_conflict_state wsrep_conflict_state;
   mysql_mutex_t             LOCK_wsrep_thd;
-  mysql_cond_t              COND_wsrep_thd;
   wsrep_trx_meta_t          wsrep_trx_meta;
   uint32                    wsrep_rand;
   Relay_log_info            *wsrep_rli;

sql/wsrep_mysqld.cc

@@ -123,7 +123,7 @@ PSI_mutex_key key_LOCK_wsrep_rollback, key_LOCK_wsrep_thd,
   key_LOCK_wsrep_slave_threads, key_LOCK_wsrep_desync,
   key_LOCK_wsrep_config_state;
 
-PSI_cond_key key_COND_wsrep_rollback, key_COND_wsrep_thd,
+PSI_cond_key key_COND_wsrep_rollback,
   key_COND_wsrep_replaying, key_COND_wsrep_ready, key_COND_wsrep_sst,
   key_COND_wsrep_sst_init, key_COND_wsrep_sst_thread;
 
@@ -149,7 +149,6 @@ static PSI_cond_info wsrep_conds[]=
   { &key_COND_wsrep_sst_init, "COND_wsrep_sst_init", PSI_FLAG_GLOBAL},
   { &key_COND_wsrep_sst_thread, "wsrep_sst_thread", 0},
   { &key_COND_wsrep_rollback, "COND_wsrep_rollback", PSI_FLAG_GLOBAL},
-  { &key_COND_wsrep_thd, "THD::COND_wsrep_thd", 0},
   { &key_COND_wsrep_replaying, "COND_wsrep_replaying", PSI_FLAG_GLOBAL}
 };
 #else