Revert two Kernel changes that were causing test failures.

tests/language_2/async_await_catch_regression_test.dart

Index: tests/language_2/async_await_catch_regression_test.dart
diff --git a/tests/language_2/async_await_catch_regression_test.dart b/tests/language_2/async_await_catch_regression_test.dart
deleted file mode 100644
index b83b0b1b0f2e6fd8c90ce27b8120365fb8b0867d..0000000000000000000000000000000000000000
--- a/tests/language_2/async_await_catch_regression_test.dart
+++ /dev/null
@@ -1,26 +0,0 @@
-// 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.
-
-import "package:expect/expect.dart";
-import "package:async_helper/async_helper.dart";
-
-foo() async {
-  throw 42;
-}
-
-test() async {
-  var exception;
-  try {
-    await foo();
-  } catch (e) {
-    print(await (e));
-    await (exception = await e);
-  }
-  Expect.equals(42, exception);
-}
-
-main() {
-  asyncStart();
-  test().then((_) => asyncEnd());
-}