Insert the right checks for redirecting factories to deferred constructors.

tests/language/deferred_redirecting_factory_lib1.dart

Index: tests/language/deferred_redirecting_factory_lib1.dart
diff --git a/tests/language/deferred_redirecting_factory_lib1.dart b/tests/language/deferred_redirecting_factory_lib1.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e9100fb40fe839a695e765efb4d2eefba3499bb1
--- /dev/null
+++ b/tests/language/deferred_redirecting_factory_lib1.dart
@@ -0,0 +1,18 @@
+// Copyright (c) 2015, 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 lib1;
+
+import "deferred_redirecting_factory_lib2.dart" deferred as lib2;
+import "deferred_redirecting_factory_test.dart" as main;
+
+loadLib2() {
+  return lib2.loadLibrary();
+}
+
+class C extends main.C {
+  String get foo => "lib1";
+  C();
+  factory C.a() = lib2.C;
+}