Added bool.hashCode patch.

tests/corelib/bool_hashcode_test.dart

Index: tests/corelib/bool_hashcode_test.dart
===================================================================
--- tests/corelib/bool_hashcode_test.dart	(revision 0)
+++ tests/corelib/bool_hashcode_test.dart	(revision 0)
@@ -0,0 +1,13 @@
+// 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.
+
+class BoolHashCodeTest {
+  static testMain() {
+    Expect.notEquals(true.hashCode, false.hashCode);
+  }
+}
+
+main() {
+  BoolHashCodeTest.testMain();
+}