Add test that uses function.apply and mirrors in the same file.

tests/lib/mirrors/function_apply_mirrors_lib.dart

Index: tests/lib/mirrors/function_apply_mirrors_lib.dart
diff --git a/tests/compiler/dart2js_extra/deferred_split_lib2.dart b/tests/lib/mirrors/function_apply_mirrors_lib.dart
similarity index 60%
copy from tests/compiler/dart2js_extra/deferred_split_lib2.dart
copy to tests/lib/mirrors/function_apply_mirrors_lib.dart
index d690e311ecee452f767aa8ea630e510b8c780bbc..e94a55a1df329627010a6a01d147c2a8f7a69467 100644
--- a/tests/compiler/dart2js_extra/deferred_split_lib2.dart
+++ b/tests/lib/mirrors/function_apply_mirrors_lib.dart
@@ -2,8 +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.
 
-// Deferred library loaded by deferred_split_test.dart
+library function_apply_mirrors_lib;
 
-import 'deferred_split_lib1.dart';
+@MirrorsUsed(targets: "function_apply_mirrors_lib")
+import "dart:mirrors";
 
-createA() => new A();
+bar() => reflect(499).reflectee;