[runtime] Optimize and unify rest parameters.

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index 56b8aa6e45c218c5867fa44fc3e935add127b097..3befe1aeec11f3f2f64fbddf8ea6aeafa490a09c 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -280,6 +280,13 @@ Callable CodeFactory::FastNewClosure(Isolate* isolate,
 
 
 // static
+Callable CodeFactory::FastNewRestParameter(Isolate* isolate) {
+  FastNewRestParameterStub stub(isolate);
+  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
+}
+
+
+// static
 Callable CodeFactory::ArgumentsAccess(Isolate* isolate,
                                       bool is_unmapped_arguments,
                                       bool has_duplicate_parameters) {
@@ -291,13 +298,6 @@ Callable CodeFactory::ArgumentsAccess(Isolate* isolate,
 
 
 // static
-Callable CodeFactory::RestArgumentsAccess(Isolate* isolate) {
-  RestParamAccessStub stub(isolate);
-  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
-}
-
-
-// static
 Callable CodeFactory::AllocateHeapNumber(Isolate* isolate) {
   AllocateHeapNumberStub stub(isolate);
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());