Migrated test lock 217 to Dart 2.0.

tests/lib_2/mirrors/accessor_cache_overflow_test.dart

 // Copyright (c) 2014, 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.
 
 // This test runs invokes getField and setField enough times to get cached
 // closures generated and with enough different field names to trip the path
 // that flushes the closure cache.
 
 library test.hot_get_field;
 
@@ skipping 288 matching lines @@
   var vF7;
   var vF8;
   var vF9;
   var vFA;
   var vFB;
   var vFC;
   var vFD;
   var vFE;
   var vFF;
 }