[es6] Re-implement rest parameters via desugaring.

src/ia32/code-stubs-ia32.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.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 1122 matching lines @@
   // Return and remove the on-stack parameters.
   __ bind(&done);
   __ ret(3 * kPointerSize);
 
   // Do the runtime call to allocate the arguments object.
   __ bind(&runtime);
   __ TailCallRuntime(Runtime::kNewStrictArguments, 3, 1);
 }
 
 
-void RestParamAccessStub::GenerateNew(MacroAssembler* masm) {
-  // esp[0] : return address
-  // esp[4] : language mode
-  // esp[8] : index of rest parameter
-  // esp[12] : number of parameters
-  // esp[16] : receiver displacement
-
-  // Check if the calling frame is an arguments adaptor frame.
-  Label runtime;
-  __ mov(edx, Operand(ebp, StandardFrameConstants::kCallerFPOffset));
-  __ mov(ecx, Operand(edx, StandardFrameConstants::kContextOffset));
-  __ cmp(ecx, Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
-  __ j(not_equal, &runtime);
-
-  // Patch the arguments.length and the parameters pointer.
-  __ mov(ecx, Operand(edx, ArgumentsAdaptorFrameConstants::kLengthOffset));
-  __ mov(Operand(esp, 3 * kPointerSize), ecx);
-  __ lea(edx, Operand(edx, ecx, times_2,
-                      StandardFrameConstants::kCallerSPOffset));
-  __ mov(Operand(esp, 4 * kPointerSize), edx);
-
-  __ bind(&runtime);
-  __ TailCallRuntime(Runtime::kNewRestParam, 4, 1);
-}
-
-
 void RegExpExecStub::Generate(MacroAssembler* masm) {
   // Just jump directly to runtime if native RegExp is not selected at compile
   // time or if regexp entry in generated code is turned off runtime switch or
   // at compilation.
 #ifdef V8_INTERPRETED_REGEXP
   __ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
 #else  // V8_INTERPRETED_REGEXP
 
   // Stack frame on entry.
   //  esp[0]: return address
@@ skipping 4392 matching lines @@
                            Operand(ebp, 7 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32