Fix hidden properties to ignore [[Extensible]].

src/objects.cc

 // 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 3733 matching lines @@
                                         &attributes)->ToObjectUnchecked();
     if (!lookup->IsUndefined()) {
       return StringDictionary::cast(lookup);
     }
   }
   if (!create_if_absent) return GetHeap()->undefined_value();
   const int kInitialSize = 5;
   MaybeObject* dict_alloc = StringDictionary::Allocate(kInitialSize);
   StringDictionary* dictionary;
   if (!dict_alloc->To<StringDictionary>(&dictionary)) return dict_alloc;
-  MaybeObject* store_result =
-      SetPropertyPostInterceptor(GetHeap()->hidden_symbol(),
-                                 dictionary,
-                                 DONT_ENUM,
-                                 kNonStrictMode);
-  if (store_result->IsFailure()) return store_result;
-  return dictionary;
+  // Using AddProperty or SetPropertyPostInterceptor here could fail, because
+  // object might be non-extensible.
+  return HasFastProperties()
+      ? AddFastProperty(GetHeap()->hidden_symbol(), dictionary, DONT_ENUM)
+      : AddSlowProperty(GetHeap()->hidden_symbol(), dictionary, DONT_ENUM);
 }
 
 
 MaybeObject* JSObject::SetHiddenPropertiesDictionary(
     StringDictionary* dictionary) {
   ASSERT(!IsJSGlobalProxy());
   ASSERT(HasHiddenProperties());
   if (HasFastProperties()) {
     // If the object has fast properties, check whether the first slot
     // in the descriptor array matches the hidden symbol. Since the
@@ skipping 9194 matching lines @@
   set_year(Smi::FromInt(year), SKIP_WRITE_BARRIER);
   set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
   set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
   set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
   set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
   set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
 } }  // namespace v8::internal