Add mirrors tests

test/codegen/lib/mirrors/function_apply_mirrors_lib.dart

Index: test/codegen/lib/mirrors/function_apply_mirrors_lib.dart
diff --git a/test/codegen/language/deferred_redirecting_factory_lib2.dart b/test/codegen/lib/mirrors/function_apply_mirrors_lib.dart
similarity index 60%
copy from test/codegen/language/deferred_redirecting_factory_lib2.dart
copy to test/codegen/lib/mirrors/function_apply_mirrors_lib.dart
index 62cbf143873010ef6252c0369b4135afcce6bfed..e94a55a1df329627010a6a01d147c2a8f7a69467 100644
--- a/test/codegen/language/deferred_redirecting_factory_lib2.dart
+++ b/test/codegen/lib/mirrors/function_apply_mirrors_lib.dart
@@ -2,10 +2,9 @@
 // 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 lib2;
+library function_apply_mirrors_lib;
 
-import "deferred_redirecting_factory_lib1.dart" as lib1;
+@MirrorsUsed(targets: "function_apply_mirrors_lib")
+import "dart:mirrors";
 
-class C extends lib1.C {
-  String get foo => "lib2";
-}
+bar() => reflect(499).reflectee;