Rewrite negative const tests into a few multi tests.

tests/language/src/ConstFieldNegativeTest.dart

Index: tests/language/src/ConstFieldNegativeTest.dart
diff --git a/tests/language/src/ConstFieldNegativeTest.dart b/tests/language/src/ConstFieldNegativeTest.dart
deleted file mode 100644
index 8eaee6f74920301ed01f3221f09b6307c0f360e6..0000000000000000000000000000000000000000
--- a/tests/language/src/ConstFieldNegativeTest.dart
+++ /dev/null
@@ -1,11 +0,0 @@
-// 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.
-
-class ConstFieldNegativeTest {
-  static const int FOO = 42;
-}
-
-main() {
-  Expect.equals(42, ConstFieldNegativeTest.FOO);
-}