Fix for issue 22778, stored the function object in the forward reference table instead of the impli…

tests/isolate/issue_22778_test.dart

+// Copyright (c) 2015, 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 "dart:isolate";
+import "package:expect/expect.dart";
+
+func(){}
+
+main() {
+  var r = new RawReceivePort();
+  r.handler = (v) {
+    Expect.isTrue(v[0] == v[1]);
+    r.close();
+  };
+  r.sendPort.send([func, func]);
+}