Partial revert of rest parameter 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 06e43301000c6f77341a4c4a1e265ed097f29e78..4de6e610fa5d5cda032951f3b071afd242e05ee3 100644
--- a/src/full-codegen/ia32/full-codegen-ia32.cc
+++ b/src/full-codegen/ia32/full-codegen-ia32.cc
@@ -254,6 +254,27 @@ void FullCodeGenerator::Generate() {
     SetVar(new_target_var, edx, ebx, ecx);
   }
 
+  // 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())));
+    function_in_register = false;
+
+    RestParamAccessStub stub(isolate());
+    __ CallStub(&stub);
+    SetVar(rest_param, eax, ebx, edx);
+  }
+
   Variable* arguments = scope()->arguments();
   if (arguments != NULL) {
     // Function uses arguments object.