Migrated test block 25 to Dart 2.0.

tests/corelib/regress_r21715_test.dart

Index: tests/corelib/regress_r21715_test.dart
diff --git a/tests/corelib/regress_r21715_test.dart b/tests/corelib/regress_r21715_test.dart
deleted file mode 100644
index 5a0ef73d9369efcdc5c89244bfcca25cf1299657..0000000000000000000000000000000000000000
--- a/tests/corelib/regress_r21715_test.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright (c) 2014, 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=--optimization_counter_threshold=5 --no-background_compilation
-
-import "package:expect/expect.dart";
-
-sll(x, shift) => x << shift;
-
-main() {
-  for (int i = 0; i < 10; i++) {
-    var x = 0x50000000;
-    var shift = 34;
-    Expect.equals(sll(x, shift), 0x14000000000000000);
-  }
-}