Revert "Merge more Kernel infrastructure from kernel_sdk SDK fork."

tests/kernel/unsorted/getters_and_setters_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 'expect.dart';
-
-var field;
-
-get getField {
-  print('B.getField');
-  return field;
-}
-
-set setField(value) {
-  print('B.setField');
-  field = value;
-  return null;
-}
-
-main() {
-  var result;
-
-  result = (field = 42);
-  Expect.isTrue(result == 42);
-  Expect.isTrue(field == 42);
-  Expect.isTrue(getField == 42);
-
-  result = (setField = 99);
-  Expect.isTrue(result == 99);
-  Expect.isTrue(field == 99);
-  Expect.isTrue(getField == 99);
-}