Add mirrors tests

test/codegen/lib/mirrors/reflect_class_test.dart

+// 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.
+
+import "dart:mirrors";
+
+import "package:expect/expect.dart";
+
+typedef void FooFunction(int a, double b);
+
+main() {
+  Function expectedError = (e) => e is ArgumentError || e is TypeError;
+
+  Expect.throws(() => reflectClass(dynamic), expectedError);
+  Expect.throws(() => reflectClass(1), expectedError);  /// 01: static type warning
+  Expect.throws(() => reflectClass("string"), expectedError);  /// 02: static type warning
+  Expect.throws(() => reflectClass(FooFunction), expectedError);
+}