test rename overhaul: step 8 - language tests

tests/language/override_field_test.dart

 // Copyright (c) 2011, 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.
 // Dart test checking that static/instance field shadowing do not conflict.
 
 class A {
   A() {}  // DartC has no implicit constructors yet.
 
   int instanceFieldInA;
   static int staticFieldInA;
 }
 
 class B extends A {
   B() : super() {}  // DartC has no implicit constructors yet.
 
   static int instanceFieldInA; /// 01: compile-time error
   int staticFieldInA; /// 02: static type warning
   static int staticFieldInA; /// 03: static type warning
   int instanceFieldInA; /// 04: compile-time error
 }
 
 main() {
   var x  = new B();
 }