fix some tests

tests/language/src/ConstructorRedirect2NegativeTest.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.
 // Redirection constructors must not be cyclic.
 
 class A {
   var x;
   A(x) : this(0);
 }
 
 class ConstructorRedirect2NegativeTest {
   static testMain() {
+    new A(10);
   }
 }
 
 main() {
   ConstructorRedirect2NegativeTest.testMain();
 }