Rewrite negative const tests into a few multi tests.

tests/language/src/ConstInit3NegativeTest.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 program for testing circular initialization errors.
-
-class ConstInit3NegativeTest {
-  static final N = O + 1;                // ok
-  static final O = N + 1;                // Error: circular reference
-
-  static testMain() {
-    Expect.equals(null, N);
-  }
-}
-
-main() {
-  ConstInit3NegativeTest.testMain();
-}