InnoDB: Remove a redundant condition and an outdated comment

Since MariaDB 10.2.2, temporary table metadata is not written
to the InnoDB data dictionary tables. Therefore,
the DICT_TF2_TEMPORARY flag cannot be set in SYS_TABLES,
except if there exist orphan temporary tables that were created
before MariaDB 10.2.2.

trx_resurrect_table_locks(): Do not skip temporary tables.
If a resurrect transaction modified a temporary table that was
created before MariaDB 10.2.2, that table would be treated
internally as a persistent table. It is safer to resurrect
locks than to skip the table, because the table would be modified
on transaction rollback.

storage/innobase/dict/dict0boot.cc

@@ -342,8 +342,7 @@ dict_boot(void)
 	dict_mem_table_add_col(table, heap, "TYPE", DATA_INT, 0, 4);
 	dict_mem_table_add_col(table, heap, "MIX_ID", DATA_BINARY, 0, 0);
 	/* MIX_LEN may contain additional table flags when
-	ROW_FORMAT!=REDUNDANT.  Currently, these flags include
-	DICT_TF2_TEMPORARY. */
+	ROW_FORMAT!=REDUNDANT. */
 	dict_mem_table_add_col(table, heap, "MIX_LEN", DATA_INT, 0, 4);
 	dict_mem_table_add_col(table, heap, "CLUSTER_NAME", DATA_BINARY, 0, 0);
 	dict_mem_table_add_col(table, heap, "SPACE", DATA_INT, 0, 4);

storage/innobase/trx/trx0trx.cc

@@ -772,8 +772,7 @@ trx_resurrect_table_locks(
 	     i != tables.end(); i++) {
 		if (dict_table_t* table = dict_table_open_on_id(
 			    *i, FALSE, DICT_TABLE_OP_LOAD_TABLESPACE)) {
-			if (!table->is_readable()
-			    || dict_table_is_temporary(table)) {
+			if (!table->is_readable()) {
 				mutex_enter(&dict_sys->mutex);
 				dict_table_close(table, TRUE, FALSE);
 				dict_table_remove_from_cache(table);