Add corelib tests

test/codegen/corelib/print_test.dart

 // Copyright (c) 2013, 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';
 
-class Super<T extends num> {}
-class Malbounded extends Super<String> {}
+class A {
+  toString() {
+    if (false
+          || true  /// 01: runtime error
+        ) {
+      return 499;
+    } else {
+      return "ok";
+    }
+  }
+}
 
 main() {
-  Type t = Malbounded;
-  Expect.isNotNull(t);
-  Expect.isTrue(t is Type);
+  print(new A());
 }