Add mirrors tests

test/codegen/lib/mirrors/abstract_test.dart

Index: test/codegen/lib/mirrors/abstract_test.dart
diff --git a/test/codegen/language/regress_13462_0_test.dart b/test/codegen/lib/mirrors/abstract_test.dart
similarity index 52%
copy from test/codegen/language/regress_13462_0_test.dart
copy to test/codegen/lib/mirrors/abstract_test.dart
index b87bf1f24d7378ea99edd41562464cc8f67ffed6..39923639e08b8a559e2de07d8e825a78c6a994eb 100644
--- a/test/codegen/language/regress_13462_0_test.dart
+++ b/test/codegen/lib/mirrors/abstract_test.dart
@@ -2,8 +2,18 @@
 // 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.
 
+// Test abstract classes are retained.
+
+library test.abstract_test;
+
 import 'dart:mirrors';
 
-main() {
-  print(MirrorSystem.getName(#foo));
+import 'stringify.dart';
+
+abstract class Foo {
+}
+
+void main() {
+  expect('Class(s(Foo) in s(test.abstract_test), top-level)',
+         reflectClass(Foo));
 }