Moved assertion test from VM tests to language. Since it fails with

runtime/tests/vm/dart/assert_with_type_test_or_cast_test.dart

Index: runtime/tests/vm/dart/assert_with_type_test_or_cast_test.dart
===================================================================
--- runtime/tests/vm/dart/assert_with_type_test_or_cast_test.dart	(revision 11850)
+++ runtime/tests/vm/dart/assert_with_type_test_or_cast_test.dart	(working copy)
@@ -1,27 +0,0 @@
-// VMOptions=
-// VMOptions=--enable_asserts
-
-// 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.
-
-// Issue 3741: generic type tests and casts fail in assertion statements
-// when run in production mode.  
-//
-// The cause was incomplete generic type skipping, so each of the assert
-// statements below would fail.
-main() {
- var names = new List<int>();
- 
- // Generic type test.
- assert(names is List<int>);
- 
- // Negated generic type test.
- assert(names is !List<String>);
- 
- // Generic type cast.
- assert((names as List<num>).length == 0);
- 
- // Generic type test inside expression.
- assert((names is List<int>));
-}