Re-land beginning Dart 2.0 test migration.

tests/language_2/compiler_annotations.dart

Index: tests/language_2/compiler_annotations.dart
diff --git a/tests/language_2/compiler_annotations.dart b/tests/language_2/compiler_annotations.dart
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+// Copyright (c) 2013, 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.
+
+library compiler_annotations;
+
+// This library contains annotations useful for testing.
+
+// TODO(ngeoffray): Implement in dart2js.
+class DontInline {
+  const DontInline();
+}