Rewrite the const constructor negative tests into a single multi test.

tests/language/src/ConstConstructor1NegativeTest.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.
-// Check that class allocated via 'const' has a const constructor.
-
-interface I default C {
-  I(int i);
-}
-
-class C implements I {
-  C(int this.i) {}  // <- missing const constructor.
-  final int i;
-}
-
-
-class ConstConstructor1NegativeTest {
-  static testMain() {
-    var i = const I(5);
-    print("Expected compilation failure: ${i.i}");
-  }
-}
-
-main() {
-  ConstConstructor1NegativeTest.testMain();
-}