Add @MirrorsUsed annotations to speed up tests.

tests/lib/mirrors/local_function_is_static_test.dart

 // 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.
 
 library test.local_function_is_static;
 
+@MirrorsUsed(targets: "test.local_function_is_static")
 import 'dart:mirrors';
 import 'package:expect/expect.dart';
 
 topLevel() => 1;
 topLevelLocal() => () => 2;
 class C {
   static klass() => 3;
   static klassLocal() => () => 4;
   instance() => 5;
   instanceLocal() => () => 6;
@@ skipping 17 matching lines @@
   Expect.isTrue((reflect(f) as ClosureMirror).function.isStatic);
 
   f = new C().instance;
   Expect.equals(5, f());
   Expect.isFalse((reflect(f) as ClosureMirror).function.isStatic);
 
   f = new C().instanceLocal();
   Expect.equals(6, f());
   Expect.isFalse((reflect(f) as ClosureMirror).function.isStatic);
 }