Optimized TurboFan support for rest args.

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index 8d7eddc1242c83e025a9c788e5a9be4492becc42..949bf9ab9c9db30155785457c92fbdf1172d87fd 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -282,6 +282,13 @@ 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());