Support for type dynamic in VM

tests/language/type_cast_vm_test.dart

 // Copyright (c) 2012, 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=--no_show_internal_names
 //
 // Dart test program testing type casts.
 
 // Test that the initializer expression gets properly skipped.
 bool b = "foo" as double;
 
@@ skipping 114 matching lines @@
     int result = 0;
     Function anyFunction;
     f() { };
     anyFunction = f as Function;  // No error.
     anyFunction = null as Function;  // No error.
     try {
       var i = f as int;  // Throws a TypeError if type checks are enabled.
     } on TypeError catch (error) {
       result = 1;
       Expect.equals("int", error.dstType);
-      Expect.equals("() => Dynamic", error.srcType);
+      Expect.equals("() => dynamic", error.srcType);
       Expect.equals("type cast", error.dstName);
       int pos = error.url.lastIndexOf("/", error.url.length);
       if (pos == -1) {
         pos = error.url.lastIndexOf("\\", error.url.length);
       }
       String subs = error.url.substring(pos + 1, error.url.length);
       Expect.equals("type_cast_vm_test.dart", subs);
       Expect.equals(131, error.line);
       Expect.equals(17, error.column);
     }
     return result;
   }
 
   static testMain() {
     Expect.equals(1, test());
     Expect.equals(1, testSideEffect());
     Expect.equals(1, testArgument());
     Expect.equals(1, testReturn());
     Expect.equals(1, testField());
     Expect.equals(1, testAnyFunction());
   }
 }
 
 
 main() {
   TypeTest.testMain();
 }