[runtime] Minor tweaks to LookupIterator for performance

src/lookup.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_LOOKUP_H_
 #define V8_LOOKUP_H_
 
 #include "src/factory.h"
 #include "src/isolate.h"
 #include "src/objects.h"
@@ skipping 192 matching lines @@
   bool HolderIsReceiverOrHiddenPrototype() const;
 
   bool check_prototype_chain() const {
     return (configuration_ & kPrototypeChain) != 0;
   }
 
   /* ACCESS_CHECK */
   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();
   void TransitionToAccessorProperty(AccessorComponent component,
                                     Handle<Object> accessor,
                                     PropertyAttributes attributes);
   void TransitionToAccessorPair(Handle<Object> pair,
                                 PropertyAttributes attributes);
   PropertyDetails property_details() const {
     DCHECK(has_property_);
@@ skipping 102 matching lines @@
   Handle<Map> holder_map_;
   const Handle<JSReceiver> initial_holder_;
   uint32_t number_;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_LOOKUP_H_