Revert two Kernel changes that were causing test failures.

tests/language_strong/async_star_regression_fisk_test.dart

 // Copyright (c) 2015, 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.
 
 // This test may crash dart2js.
 
 import "dart:async";
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 
@@ skipping 39 matching lines @@
       "done",
       "fisk 1",
       "+fisk",
       0,
       "-fisk",
       "done"
     ], res);
     asyncEnd();
   });
 }