Add mirrors tests

test/codegen/lib/mirrors/unused_mirrors6_test.dart

Index: test/codegen/lib/mirrors/unused_mirrors6_test.dart
diff --git a/test/codegen/lib/mirrors/unused_mirrors6_test.dart b/test/codegen/lib/mirrors/unused_mirrors6_test.dart
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index 0000000000000000000000000000000000000000..36d14d5b5fc48978bddfe6ceea395671b09bed15
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+++ b/test/codegen/lib/mirrors/unused_mirrors6_test.dart
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+// Copyright (c) 2014, 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.
+
+// Tests that MirrorsUsed without usage of the static field does not crash
+// dart2js.
+
+library lib;
+
+@MirrorsUsed(targets: const ["C"])
+import 'dart:mirrors';
+
+class C {
+  static Bar get foo => new Bar();
+}
+
+typedef int FunctionTypeDef();
+
+class Bar {
+  final FunctionTypeDef gee;
+  Bar() : gee = (() => 499);
+}
+
+main() {
+  // Don't do anything.
+}