test rename overhaul: step 8 - language tests

tests/language/src/Switch5NegativeTest.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.
-// Break' to case label is illegal.
-
-class Switch5NegativeTest {
-
-  static testMain() {
-    var a = 5;
-    var x;
-    switch (a) {
-      L:
-      case 1:
-        x = 1; break;
-      case 6:
-        x = 2; break L;  // illegal
-      default:
-        break;
-    }
-    return a;
-  }
-}
-
-main() {
-  Switch5NegativeTest.testMain();
-}