Partial revert of rest parameter desugaring.

src/full-codegen/arm/full-codegen-arm.cc

Index: src/full-codegen/arm/full-codegen-arm.cc
diff --git a/src/full-codegen/arm/full-codegen-arm.cc b/src/full-codegen/arm/full-codegen-arm.cc
index e10cb4ab7001e464835f8bb86caaec18fa5bd2ab..c34db15e163d2f07f51f8311f1f7f6cea25b6b20 100644
--- a/src/full-codegen/arm/full-codegen-arm.cc
+++ b/src/full-codegen/arm/full-codegen-arm.cc
@@ -259,6 +259,28 @@ void FullCodeGenerator::Generate() {
     SetVar(new_target_var, r3, r0, r2);
   }
 
+  // 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;
+
+    __ add(r3, fp, Operand(StandardFrameConstants::kCallerSPOffset + offset));
+    __ mov(r2, Operand(Smi::FromInt(num_parameters)));
+    __ mov(r1, Operand(Smi::FromInt(rest_index)));
+    __ mov(r0, Operand(Smi::FromInt(language_mode())));
+    __ Push(r3, r2, r1, r0);
+    function_in_register_r1 = false;
+
+    RestParamAccessStub stub(isolate());
+    __ CallStub(&stub);
+
+    SetVar(rest_param, r0, r1, r2);
+  }
+
   Variable* arguments = scope()->arguments();
   if (arguments != NULL) {
     // Function uses arguments object.