Load deferred chunks in the right order.

tests/compiler/dart2js_extra/deferred/deferred_overlapping_lib1.dart

Index: tests/compiler/dart2js_extra/deferred/deferred_overlapping_lib1.dart
diff --git a/tests/language/deferred_shadow_load_library_lib.dart b/tests/compiler/dart2js_extra/deferred/deferred_overlapping_lib1.dart
similarity index 77%
copy from tests/language/deferred_shadow_load_library_lib.dart
copy to tests/compiler/dart2js_extra/deferred/deferred_overlapping_lib1.dart
index e7811aaaf594ef108f931399a08ecb93761ccfdf..3f72583d9f4391087fb4a2ad5ef5f945d50b6865 100644
--- a/tests/language/deferred_shadow_load_library_lib.dart
+++ b/tests/compiler/dart2js_extra/deferred/deferred_overlapping_lib1.dart
@@ -2,6 +2,6 @@
 // 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.
 
-loadLibrary() => 42;
+import "deferred_overlapping_lib3.dart";
 
-var trueVar = true;
+class C1 extends C3 {}