Normalize constructor lookup.

tests/language/private_super_constructor_lib.dart

Index: tests/language/private_super_constructor_lib.dart
diff --git a/tests/compiler/dart2js/dart2js_batch2_run.dart b/tests/language/private_super_constructor_lib.dart
similarity index 75%
copy from tests/compiler/dart2js/dart2js_batch2_run.dart
copy to tests/language/private_super_constructor_lib.dart
index aee55ef18e5fa77c47bcbf53f5c16125299ed77a..8a34b6db29bbd2794d8c60eca91a8c935614c1f9 100644
--- a/tests/compiler/dart2js/dart2js_batch2_run.dart
+++ b/tests/language/private_super_constructor_lib.dart
@@ -2,9 +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.
 
-@notExisting
-var x;
+library private_super_constructor_lib;
 
-main() {
-  print(x);
-}
+class B {
+  B();
+  B._foo();
+}