Test for deferred prefix dependent code invalidation

tests/language/deferred_load_inval_code_lib.dart

Index: tests/language/deferred_load_inval_code_lib.dart
===================================================================
--- tests/language/deferred_load_inval_code_lib.dart	(revision 0)
+++ tests/language/deferred_load_inval_code_lib.dart	(working copy)
@@ -0,0 +1,7 @@
+// 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.
+
+foo() {
+  return "foo from library";
+}