Add ES5 Object.isExtensible and Object.preventExtensions.

src/runtime.h

 // Copyright 2006-2008 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 54 matching lines @@
   F(GetGlobalReceiver, 0, 1) \
   \
   F(IsInPrototypeChain, 2, 1) \
   F(SetHiddenPrototype, 2, 1) \
   \
   F(IsConstructCall, 0, 1) \
   \
   F(GetOwnProperty, 2, 1) \
   \
   F(IsExtensible, 1, 1) \
+  F(PreventExtensions, 1, 1)\
   \
   /* Utilities */ \
   F(GetFunctionDelegate, 1, 1) \
   F(GetConstructorDelegate, 1, 1) \
   F(NewArgumentsFast, 3, 1) \
   F(LazyCompile, 1, 1) \
   F(SetNewFunctionAttributes, 1, 1) \
   \
   /* Array join support */ \
   F(PushIfAbsent, 2, 1) \
@@ skipping 362 matching lines @@
                                                 int position);
 
   // Helper functions used stubs.
   static void PerformGC(Object* result);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_H_