include type parameters on generic sync/async functions

test/codegen/language/generic_async_test.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
 
-void main() {
-  dynamic x = 3;
-  Expect.equals(3, x.hashCode);
+import 'dart:async';
+
+Future/*<T>*/ foo/*<T>*/(/*=T*/ x) async => x;
+
+main() async {
+  Expect.equals(1, await foo/*<int>*/(1));
 }