Added bool.hashCode patch.

runtime/lib/bool_patch.dart

Index: runtime/lib/bool_patch.dart
===================================================================
--- runtime/lib/bool_patch.dart	(revision 0)
+++ runtime/lib/bool_patch.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.
+
+// Dart core library.
+
+patch class bool {
+  
+  /* patch */ int get hashCode {
+    return this ? 1231 : 1237;
+  }
+  // Object.equals is fine, since true and false are singletons.

[cshapiro, 2012/12/12 00:35:13]

Presumably, this is defaulting to some sort of is-same-object equals method?  Is
there any harm in putting in an equals method?

[srdjan, 2012/12/12 00:55:25]

Object's equal calls identical.

AFAIK, compiler has optimizations where it recognizes that equal was not
overriden, therefore I would not replicate code here.

+}