Correct semantics for numerically indexed stores to typed arrays.

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 120 matching lines @@
     return property_details().representation();
   }
   FieldIndex GetFieldIndex() const;
   Handle<HeapType> GetFieldType() const;
   int GetConstantIndex() const;
   Handle<PropertyCell> GetPropertyCell() const;
   Handle<Object> GetAccessors() const;
   Handle<Object> GetDataValue() const;
   void WriteDataValue(Handle<Object> value);
 
+  // Checks whether the receiver is an indexed exotic object
+  // and name is a special numeric index.
+  bool IsSpecialNumericIndex() const;
+
   void InternalizeName();
 
  private:
   Handle<Map> GetReceiverMap() const;
 
   MUST_USE_RESULT inline JSReceiver* NextHolder(Map* map);
   inline State LookupInHolder(Map* map, JSReceiver* holder);
   Handle<Object> FetchValue() const;
   void ReloadPropertyInformation();
 
@@ skipping 39 matching lines @@
   Handle<Object> receiver_;
   Handle<JSReceiver> holder_;
 
   int number_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOOKUP_H_