[runtime] Minor tweaks to LookupIterator for performance

src/lookup.h

Index: src/lookup.h
diff --git a/src/lookup.h b/src/lookup.h
index 60f171c2d79d7c565c6f2380a060d37e1e92ad89..deed5a7bbf01855040a66f2cd2138a0a66ff6c69 100644
--- a/src/lookup.h
+++ b/src/lookup.h
@@ -210,17 +210,23 @@ class LookupIterator final BASE_EMBEDDED {
   bool HasAccess() const;
 
   /* PROPERTY */
+  bool ExtendingNonExtensible(Handle<JSObject> receiver) {
+    DCHECK(receiver.is_identical_to(GetStoreTarget()));
+    return !receiver->map()->is_extensible() &&
+           (IsElement() || !isolate_->IsInternallyUsedPropertyName(name_));
+  }
   void PrepareForDataProperty(Handle<Object> value);
-  void PrepareTransitionToDataProperty(Handle<Object> value,
+  void PrepareTransitionToDataProperty(Handle<JSObject> receiver,
+                                       Handle<Object> value,
                                        PropertyAttributes attributes,
                                        Object::StoreFromKeyed store_mode);
   bool IsCacheableTransition() {
-    if (state_ != TRANSITION) return false;
+    DCHECK_EQ(TRANSITION, state_);
     return transition_->IsPropertyCell() ||
            (!transition_map()->is_dictionary_map() &&
             transition_map()->GetBackPointer()->IsMap());
   }
-  void ApplyTransitionToDataProperty();
+  void ApplyTransitionToDataProperty(Handle<JSObject> receiver);
   void ReconfigureDataProperty(Handle<Object> value,
                                PropertyAttributes attributes);
   void Delete();