Fix OSS build to handle lack of backported PyType_Modified feature

Summary: D108322587 broke the 3.14 OSS build because our borrows now pick up the new feature but it's not available in stock CPython. This puts the code to appropriately use the META_PYTHON ifdef.

Reviewed By: itamaro

Differential Revision: D108447963

fbshipit-source-id: 7df5d321af65ea0ff1f3155c982fc323ff041189

Author: DinoV

Objects/dictobject.c

@@ -871,7 +871,11 @@ free_keys_object(PyDictKeysObject *keys, bool use_qsbr)
     size_t size = _PyDict_KeysSize(keys);
 #endif
     if (DK_KIND(keys) == DICT_KEYS_SPLIT) {
+#ifdef META_PYTHON
         ptr = _PyDictKeys_AsSharedKeys(keys);
+#else
+        ptr = keys;
+#endif
 #ifdef Py_GIL_DISABLED
         size += offsetof(struct _instancekeysobject, dsk_keys);
 #endif
@@ -2335,7 +2339,9 @@ insert_split_key(PyDictKeysObject *keys, PyObject *key, Py_hash_t hash)
     if (ix == DKIX_EMPTY && keys->dk_usable > 0) {
         // Insert into new slot
         FT_ATOMIC_STORE_UINT32_RELAXED(keys->dk_version, 0);
+#ifdef META_PYTHON
         _PyDict_SplitKeysInvalidated(keys);
+#endif
         Py_ssize_t hashpos = find_empty_slot(keys, hash);
         ix = keys->dk_nentries;
         dictkeys_set_index(keys, hashpos, ix);

Python/specialize.c

@@ -1621,6 +1621,9 @@ specialize_attr_loadclassattr(PyObject *owner, _Py_CODEUNIT *instr,
             SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OUT_OF_VERSIONS);
             return 0;
         }
+#ifndef META_PYTHON
+        write_u32(cache->keys_version, shared_keys_version);
+#endif
         specialize(instr, is_method ? LOAD_ATTR_METHOD_WITH_VALUES : LOAD_ATTR_NONDESCRIPTOR_WITH_VALUES);
     }
     else {