Use static dispatch for dynamic on Object methods

test/codegen/language/hashcode_dynamic_test.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
 import "package:expect/expect.dart";
 
 void main() {
-  Expect.throws(() => method(<int>[]), (e) => e is NoSuchMethodError);
+  dynamic x = 3;
+  Expect.equals(3, x.hashCode);
 }