Cache Object.create maps on the passed prototype's PrototypeInfo

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index aeded64a892aee49504144471c4f6ede80dafd22..7cfcf9b59846de06e50c4e04e54e05c248cd3673 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -5486,7 +5486,24 @@ ACCESSORS(AccessorInfo, data, Object, kDataOffset)
 
 ACCESSORS(Box, value, Object, kValueOffset)
 
+Map* PrototypeInfo::ObjectCreateMap() {
+  return Map::cast(WeakCell::cast(object_create_map())->value());
+}
+
+// static
+void PrototypeInfo::SetObjectCreateMap(Handle<PrototypeInfo> info,
+                                       Handle<Map> map) {
+  Handle<WeakCell> cell = Map::WeakCellForMap(map);
+  info->set_object_create_map(*cell);
+}
+
+bool PrototypeInfo::HasObjectCreateMap() {
+  Object* cache = object_create_map();
+  return cache->IsWeakCell() && !WeakCell::cast(cache)->cleared();
+}
+
 ACCESSORS(PrototypeInfo, prototype_users, Object, kPrototypeUsersOffset)
+ACCESSORS(PrototypeInfo, object_create_map, Object, kObjectCreateMap)
 SMI_ACCESSORS(PrototypeInfo, registry_slot, kRegistrySlotOffset)
 ACCESSORS(PrototypeInfo, validity_cell, Object, kValidityCellOffset)
 SMI_ACCESSORS(PrototypeInfo, bit_field, kBitFieldOffset)