MDEV-16678 fixup: Remove orphaned DBUG_EXECUTE_IF

In commit ea37b144
we removed the MDEV-16222 test case but forgot to remove
the debug instrumentation.

sql/sql_table.cc

@@ -2132,11 +2132,6 @@ bool mysql_rm_table(THD *thd,TABLE_LIST *tables, bool if_exists,
     }
   }
 
-  DBUG_EXECUTE_IF("ib_purge_virtual_mdev_16222_1",
-                  DBUG_ASSERT(!debug_sync_set_action(
-                                thd,
-                                STRING_WITH_LEN("now SIGNAL drop_started"))););
-
   /* mark for close and remove all cached entries */
   thd->push_internal_handler(&err_handler);
   error= mysql_rm_table_no_locks(thd, tables, if_exists, drop_temporary,

storage/innobase/handler/ha_innodb.cc

@@ -20568,20 +20568,6 @@ ha_innobase::multi_range_read_explain_info(
 for purge thread */
 static TABLE* innodb_find_table_for_vc(THD* thd, dict_table_t* table)
 {
-	DBUG_EXECUTE_IF(
-		"ib_purge_virtual_mdev_16222_1",
-		DBUG_ASSERT(!debug_sync_set_action(
-			    thd,
-			    STRING_WITH_LEN("ib_purge_virtual_latch_released "
-					    "SIGNAL latch_released "
-					    "WAIT_FOR drop_started"))););
-	DBUG_EXECUTE_IF(
-		"ib_purge_virtual_mdev_16222_2",
-		DBUG_ASSERT(!debug_sync_set_action(
-			    thd,
-			    STRING_WITH_LEN("ib_purge_virtual_got_no_such_table "
-					    "SIGNAL got_no_such_table"))););
-
 	TABLE *mysql_table;
 	const bool  bg_thread = THDVAR(thd, background_thread);