allow 'super' in async and finally blocks

test/codegen/language/super_in_async1_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";
 
 import 'dart:async';
 
-Stream/*<T>*/ foo/*<T>*/(/*=T*/ x) async* {
-  for (int i = 0; i < 3; i++) {
-    yield x;
+class A {
+  Future<int> foo() async => 42;
+}
+
+class B extends A {
+  Future<int> foo() async {
+    var x = await super.foo();
+    return x + 1;
   }
 }
 
 main() async {
-  await for (var x in foo/*<int>*/(1)) {
-    Expect.equals(1, x);
-  }
-}
+  Expect.equals(43, await new B().foo());
+}