Support for type dynamic in VM

tests/language/generics2_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.
 // VMOptions=--enable_type_checks
 //
 // Dart test program testing generic type allocations and generic type tests.
 
 class A<E> { }
 
-class Pair<P, Q> extends A /* i.e. extends A<Dynamic> */ {
+class Pair<P, Q> extends A /* i.e. extends A<dynamic> */ {
   final P fst;
   final Q snd;
   Pair(this.fst, this.snd);
 }
 
 main() {
   print(new Pair<int,int>(1, 2));
   print(new Pair<String,int>("1", 2));
 }