[es6] Re-implement rest parameters via desugaring.

src/full-codegen/mips/full-codegen-mips.cc

Index: src/full-codegen/mips/full-codegen-mips.cc
diff --git a/src/full-codegen/mips/full-codegen-mips.cc b/src/full-codegen/mips/full-codegen-mips.cc
index 3a296a521c9930a99cd7f3904a6570be03612c52..cdfd78547c7a7d730418472d54263e4f59f2ed02 100644
--- a/src/full-codegen/mips/full-codegen-mips.cc
+++ b/src/full-codegen/mips/full-codegen-mips.cc
@@ -295,29 +295,6 @@ void FullCodeGenerator::Generate() {
     SetVar(new_target_var, v0, a2, a3);
   }
 
-  // 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;
-
-    __ Addu(a3, fp,
-            Operand(StandardFrameConstants::kCallerSPOffset + offset));
-    __ li(a2, Operand(Smi::FromInt(num_parameters)));
-    __ li(a1, Operand(Smi::FromInt(rest_index)));
-    __ li(a0, Operand(Smi::FromInt(language_mode())));
-    __ Push(a3, a2, a1, a0);
-    function_in_register_a1 = false;
-
-    RestParamAccessStub stub(isolate());
-    __ CallStub(&stub);
-
-    SetVar(rest_param, v0, a1, a2);
-  }
-
   Variable* arguments = scope()->arguments();
   if (arguments != NULL) {
     // Function uses arguments object.