Fix performance regression caused by r11202.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1351 matching lines @@
     FORCE_DELETION
   };
 
   // A non-keyed store is of the form a.x = foo or a["x"] = foo whereas
   // a keyed store is of the form a[expression] = foo.
   enum StoreFromKeyed {
     MAY_BE_STORE_FROM_KEYED,
     CERTAINLY_NOT_STORE_FROM_KEYED
   };
 
+  // Internal properties (e.g. the hidden properties dictionary) might
+  // be added even though the receiver is non-extensible.
+  enum ExtensibilityCheck {
+    PERFORM_EXTENSIBILITY_CHECK,
+    OMIT_EXTENSIBILITY_CHECK
+  };
+
   // Casting.
   static inline JSReceiver* cast(Object* obj);
 
   static Handle<Object> SetProperty(Handle<JSReceiver> object,
                                     Handle<String> key,
                                     Handle<Object> value,
                                     PropertyAttributes attributes,
                                     StrictModeFlag strict_mode);
   // Can cause GC.
   MUST_USE_RESULT MaybeObject* SetProperty(
@@ skipping 178 matching lines @@
       StrictModeFlag strict_mode);
   MUST_USE_RESULT MaybeObject* SetPropertyWithInterceptor(
       String* name,
       Object* value,
       PropertyAttributes attributes,
       StrictModeFlag strict_mode);
   MUST_USE_RESULT MaybeObject* SetPropertyPostInterceptor(
       String* name,
       Object* value,
       PropertyAttributes attributes,
-      StrictModeFlag strict_mode);
+      StrictModeFlag strict_mode,
+      ExtensibilityCheck extensibility_check);
 
   static Handle<Object> SetLocalPropertyIgnoreAttributes(
       Handle<JSObject> object,
       Handle<String> key,
       Handle<Object> value,
       PropertyAttributes attributes);
 
   // Can cause GC.
   MUST_USE_RESULT MaybeObject* SetLocalPropertyIgnoreAttributes(
       String* key,
@@ skipping 371 matching lines @@
   MUST_USE_RESULT MaybeObject* AddSlowProperty(String* name,
                                                Object* value,
                                                PropertyAttributes attributes);
 
   // Add a property to an object.
   MUST_USE_RESULT MaybeObject* AddProperty(
       String* name,
       Object* value,
       PropertyAttributes attributes,
       StrictModeFlag strict_mode,
-      StoreFromKeyed store_mode = MAY_BE_STORE_FROM_KEYED);
+      StoreFromKeyed store_mode = MAY_BE_STORE_FROM_KEYED,
+      ExtensibilityCheck extensibility_check = PERFORM_EXTENSIBILITY_CHECK);
 
   // Convert the object to use the canonical dictionary
   // representation. If the object is expected to have additional properties
   // added this number can be indicated to have the backing store allocated to
   // an initial capacity for holding these properties.
   static void NormalizeProperties(Handle<JSObject> object,
                                   PropertyNormalizationMode mode,
                                   int expected_additional_properties);
 
   MUST_USE_RESULT MaybeObject* NormalizeProperties(
@@ skipping 6794 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_