Make initializing formals visible in the initializer list

tests/language/initializing_formal_access_test.dart

 // Copyright (c) 2016, 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.
 //
 // DartOptions=--initializing-formal-access
+// VMOptions=--initializing-formal-access
 
 import "package:expect/expect.dart";
 
 class C {
   final int x;
   final int y;
 
   const C.constant(this.x) : y = x + 1;
 
   C(this.x) : y = x + 1 {
     int z = x + 2;
     assert(z == y + 1);
   }
 }
 
 main() {
   C c = new C(2);
   Expect.equals(c.x, 2);
   Expect.equals(c.y, 3);
   const C cc = const C.constant(4);
   Expect.equals(cc.x, 4);
   Expect.equals(cc.y, 5);
 }