[es6] Re-implement rest parameters via desugaring.

src/full-codegen/ia32/full-codegen-ia32.cc

Index: src/full-codegen/ia32/full-codegen-ia32.cc
diff --git a/src/full-codegen/ia32/full-codegen-ia32.cc b/src/full-codegen/ia32/full-codegen-ia32.cc
index 3440868624158fbf25005efc04646f83d9909e54..2272e73f8421cc9153f44cc95cf304d0f22b3304 100644
--- a/src/full-codegen/ia32/full-codegen-ia32.cc
+++ b/src/full-codegen/ia32/full-codegen-ia32.cc
@@ -279,29 +279,6 @@ void FullCodeGenerator::Generate() {
     SetVar(new_target_var, eax, ebx, edx);
   }
 
-
-  // Possibly allocate RestParameters
-  int rest_index;
-  Variable* rest_param = scope()->rest_parameter(&rest_index);
-  if (rest_param) {
-    Comment cmnt(masm_, "[ Allocate rest parameter array");
-
-    int num_parameters = info->scope()->num_parameters();
-    int offset = num_parameters * kPointerSize;
-
-    __ lea(edx,
-           Operand(ebp, StandardFrameConstants::kCallerSPOffset + offset));
-    __ push(edx);
-    __ push(Immediate(Smi::FromInt(num_parameters)));
-    __ push(Immediate(Smi::FromInt(rest_index)));
-    __ push(Immediate(Smi::FromInt(language_mode())));
-
-    RestParamAccessStub stub(isolate());
-    __ CallStub(&stub);
-
-    SetVar(rest_param, eax, ebx, edx);
-  }
-
   Variable* arguments = scope()->arguments();
   if (arguments != NULL) {
     // Function uses arguments object.