Add mirrors tests

test/codegen/lib/mirrors/library_metatarget_test_lib.dart

Index: test/codegen/lib/mirrors/library_metatarget_test_lib.dart
diff --git a/test/codegen/lib/mirrors/library_metatarget_test_lib.dart b/test/codegen/lib/mirrors/library_metatarget_test_lib.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3732f926a90694bc803c7f946e3913cd75248d29
--- /dev/null
+++ b/test/codegen/lib/mirrors/library_metatarget_test_lib.dart
@@ -0,0 +1,15 @@
+// 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 library tags.
+
+@usedOnlyOnLibrary
+library subLib;
+
+import 'library_metatarget_test_annotations_lib.dart';
+
+class A {
+  @reflectable var reflectableField = 1;
+  var nonreflectableField = 2;
+}