Add mirrors tests

test/codegen/lib/mirrors/static_metatarget_test.dart

+// 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.
+
+// Regression test for the combined use of metatargets and static fields with
+// annotations.
+
+@MirrorsUsed(metaTargets:const [Reflectable])
+import 'dart:mirrors';
+
+class A {
+  @reflectable var reflectableField = 0; /// 01: ok
+
+  @UsedOnlyAsMetadata() var unreflectableField = 1; /// 02: ok
+
+  @reflectable static var reflectableStaticField = 2; /// 03: ok
+
+  @UsedOnlyAsMetadata() static var unreflectableStaticField = 3;
+}
+
+class Reflectable {
+  const Reflectable();
+}
+const Reflectable reflectable = const Reflectable();
+
+class UsedOnlyAsMetadata {
+  const UsedOnlyAsMetadata();
+}
+
+void main() {
+  print(new A());
+}