Use lazy static fields when overriding static getters or setters.

test/codegen/language/static_field_override3_test.dart

Index: test/codegen/language/static_field_override3_test.dart
diff --git a/test/codegen/language/hashcode_dynamic_test.dart b/test/codegen/language/static_field_override3_test.dart
similarity index 61%
copy from test/codegen/language/hashcode_dynamic_test.dart
copy to test/codegen/language/static_field_override3_test.dart
index b705dd8afaaf98e39def9dde62120f5eff404962..a33147d67816c83f659a9c07334e0f72beeaad89 100644
--- a/test/codegen/language/hashcode_dynamic_test.dart
+++ b/test/codegen/language/static_field_override3_test.dart
@@ -2,9 +2,16 @@
 // 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 'package:expect/expect.dart';
 
-void main() {
-  dynamic x = 3;
-  Expect.equals(3, x.hashCode);
+class Foo {
+  static int x = 42;
+}
+
+class Bar extends Foo {
+  static int x = 12;
 }
+
+void main() {
+  Expect.equals(12, Bar.x);
+}