Make sure builtin functions don't rely on __proto__.

src/runtime.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 49 matching lines @@
   F(GetInterceptorInfo, 1, 1) \
   F(GetNamedInterceptorPropertyNames, 1, 1) \
   F(GetIndexedInterceptorElementNames, 1, 1) \
   F(GetArgumentsProperty, 1, 1) \
   F(ToFastProperties, 1, 1) \
   F(FinishArrayPrototypeSetup, 1, 1) \
   F(SpecialArrayFunctions, 1, 1) \
   F(GetDefaultReceiver, 1, 1) \
   \
   F(GetPrototype, 1, 1) \
+  F(SetPrototype, 2, 1) \
   F(IsInPrototypeChain, 2, 1) \
   \
   F(GetOwnProperty, 2, 1) \
   \
   F(IsExtensible, 1, 1) \
   F(PreventExtensions, 1, 1)\
   \
   /* Utilities */ \
   F(CheckIsBootstrapping, 0, 1) \
   F(GetRootNaN, 0, 1) \
@@ skipping 632 matching lines @@
 //---------------------------------------------------------------------------
 // Constants used by interface to runtime functions.
 
 class DeclareGlobalsEvalFlag:     public BitField<bool,         0, 1> {};
 class DeclareGlobalsNativeFlag:   public BitField<bool,         1, 1> {};
 class DeclareGlobalsLanguageMode: public BitField<LanguageMode, 2, 2> {};
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_H_