Check keys kind explicitly

Author: mpage

Python/bytecodes.c

@@ -2239,7 +2239,7 @@ dummy_func(
                 DEOPT_IF(true);
             }
             PyObject *name = GETITEM(FRAME_CO_NAMES, oparg>>1);
-            if (!DK_IS_UNICODE(dict->ma_keys)) {
+            if (dict->ma_keys->dk_kind != DICT_KEYS_UNICODE) {
                 UNLOCK_OBJECT(dict);
                 DEOPT_IF(true);
             }