Add mirrors tests

test/codegen/lib/mirrors/deferred_mirrors_metatarget_test.dart

Index: test/codegen/lib/mirrors/deferred_mirrors_metatarget_test.dart
diff --git a/test/codegen/language/deferred_no_such_method_test.dart b/test/codegen/lib/mirrors/deferred_mirrors_metatarget_test.dart
similarity index 70%
copy from test/codegen/language/deferred_no_such_method_test.dart
copy to test/codegen/lib/mirrors/deferred_mirrors_metatarget_test.dart
index 9f1b232ce6d9dc4b483c9d6ff71c60f809239bee..f0091c8f328d38d2d0b016f9512670f0f6253dcf 100644
--- a/test/codegen/language/deferred_no_such_method_test.dart
+++ b/test/codegen/lib/mirrors/deferred_mirrors_metatarget_test.dart
@@ -2,15 +2,17 @@
 // 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';
+/// Test that metaTargets can be reached via the mirrorSystem.
+
 import 'package:async_helper/async_helper.dart';
+import 'package:expect/expect.dart';
 
-import "deferred_no_such_method_lib.dart" deferred as lib;
+import "deferred_mirrors_metatarget_lib.dart" deferred as lib;
 
 void main() {
   asyncStart();
   lib.loadLibrary().then((_) {
-    Expect.equals(42, new lib.C().nonExisting());
+    Expect.equals("A", lib.foo());
     asyncEnd();
   });
-}
+}