fix #543, export of properties should now work

test/codegen/language/export_order_test.dart

 // Copyright (c) 2016, 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.
 
 import 'package:expect/expect.dart';
+import 'export_order_helper1.dart' as bar;
+import 'export_order_helper2.dart';
 
-class Foo {
-  static int get x => 42;
-}
-
-class Bar extends Foo {
-  static int x = 12;
-}
+final y = 38;
+final info = new Info();
 
 void main() {
-  Expect.equals(12, Bar.x);
-}
+  Expect.equals(38, info.x);
+  Expect.equals(38, bar.y);
+}