Reapply change to Pass undefined to JS builtins when called with

src/compiler.h

 // Copyright 2011 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 71 matching lines @@
   void MarkAsInLoop() {
     ASSERT(is_lazy());
     flags_ |= IsInLoop::encode(true);
   }
   void MarkAsAllowingNativesSyntax() {
     flags_ |= IsNativesSyntaxAllowed::encode(true);
   }
   bool allows_natives_syntax() const {
     return IsNativesSyntaxAllowed::decode(flags_);
   }
+  void MarkAsNative() {
+    flags_ |= IsNative::encode(true);
+  }
+  bool is_native() const {
+    return IsNative::decode(flags_);
+  }
   void SetFunction(FunctionLiteral* literal) {
     ASSERT(function_ == NULL);
     function_ = literal;
   }
   void SetScope(Scope* scope) {
     ASSERT(scope_ == NULL);
     scope_ = scope;
   }
   void SetCode(Handle<Code> code) { code_ = code; }
   void SetExtension(v8::Extension* extension) {
@@ skipping 58 matching lines @@
   enum Mode {
     BASE,
     OPTIMIZE,
     NONOPT
   };
 
   CompilationInfo() : function_(NULL) {}
 
   void Initialize(Mode mode) {
     mode_ = V8::UseCrankshaft() ? mode : NONOPT;
-    if (!shared_info_.is_null() && shared_info_->strict_mode()) {
-      MarkAsStrictMode();
+    if (!shared_info_.is_null()) {
+      if (shared_info_->strict_mode()) MarkAsStrictMode();
+      if (shared_info_->native()) MarkAsNative();
     }
+
   }
 
   void SetMode(Mode mode) {
     ASSERT(V8::UseCrankshaft());
     mode_ = mode;
   }
 
   // Flags using template class BitField<type, start, length>.  All are
   // false by default.
   //
   // Compilation is either eager or lazy.
   class IsLazy:   public BitField<bool, 0, 1> {};
   // Flags that can be set for eager compilation.
   class IsEval:   public BitField<bool, 1, 1> {};
   class IsGlobal: public BitField<bool, 2, 1> {};
   // Flags that can be set for lazy compilation.
   class IsInLoop: public BitField<bool, 3, 1> {};
   // Strict mode - used in eager compilation.
   class IsStrictMode: public BitField<bool, 4, 1> {};
   // Native syntax (%-stuff) allowed?
   class IsNativesSyntaxAllowed: public BitField<bool, 5, 1> {};
+  // Is this a function from our natives.
+  class IsNative: public BitField<bool, 6, 1> {};
+
 
   unsigned flags_;
 
   // Fields filled in by the compilation pipeline.
   // AST filled in by the parser.
   FunctionLiteral* function_;
   // The scope of the function literal as a convenience.  Set to indicate
   // that scopes have been analyzed.
   Scope* scope_;
   // The compiled code.
@@ skipping 99 matching lines @@
       isolate->frame_element_constant_list()->Clear();
       isolate->result_constant_list()->Clear();
     }
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_