Support for type dynamic in VM

tests/language/factory2_negative_test.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.
 
 // Test compile time error for factories with parameterized types.
 
 interface Link<T> default LinkFactory {
   Link.create();
 }
 
 class LinkFactory {   // Compile time error: should be LinkFactory<T> to match interface above
   factory Link.create() {
     return null;
   }
 }
 
 main() {
-  var a = new Link.create();  // Equivalent to new Link<Dynamic>.create().
+  var a = new Link.create();  // Equivalent to new Link<dynamic>.create().
 }