[es6] re-implement rest parameters via desugaring

src/code-stubs.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/code-stubs.h"
 
 #include <sstream>
 
 #include "src/bootstrapper.h"
 #include "src/cpu-profiler.h"
@@ skipping 851 matching lines @@
     case NEW_SLOPPY_SLOW:
       GenerateNewSloppySlow(masm);
       break;
     case NEW_STRICT:
       GenerateNewStrict(masm);
       break;
   }
 }
 
 
-void RestParamAccessStub::Generate(MacroAssembler* masm) {
-  GenerateNew(masm);
-}
-
-
 void ArgumentsAccessStub::PrintName(std::ostream& os) const {  // NOLINT
   os << "ArgumentsAccessStub_";
   switch (type()) {
     case READ_ELEMENT:
       os << "ReadElement";
       break;
     case NEW_SLOPPY_FAST:
       os << "NewSloppyFast";
       break;
     case NEW_SLOPPY_SLOW:
       os << "NewSloppySlow";
       break;
     case NEW_STRICT:
       os << "NewStrict";
       break;
   }
   return;
 }
 
 
-void RestParamAccessStub::PrintName(std::ostream& os) const {  // NOLINT
-  os << "RestParamAccessStub_";
-}
-
-
 void CallFunctionStub::PrintName(std::ostream& os) const {  // NOLINT
   os << "CallFunctionStub_Args" << argc();
 }
 
 
 void CallConstructStub::PrintName(std::ostream& os) const {  // NOLINT
   os << "CallConstructStub";
   if (RecordCallTarget()) os << "_Recording";
 }
 
@@ skipping 167 matching lines @@
 
   if (type->Is(Type::UntaggedPointer())) {
     return Representation::External();
   }
 
   DCHECK(!type->Is(Type::Untagged()));
   return Representation::Tagged();
 }
 }  // namespace internal
 }  // namespace v8