fixes #221, initial sync*, async, async* implementation

test/codegen/language/async_backwards_compatibility_2_test.dart

Index: test/codegen/language/async_backwards_compatibility_2_test.dart
diff --git a/test/codegen/language/async_backwards_compatibility_2_test.dart b/test/codegen/language/async_backwards_compatibility_2_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..4f9074f3eafc7f1433be335402d556b0a835da9b
--- /dev/null
+++ b/test/codegen/language/async_backwards_compatibility_2_test.dart
@@ -0,0 +1,15 @@
+// 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.
+
+int get async { return 1; }
+
+class A {
+  async() => null;
+}
+
+main() {
+  var a = async;
+  var b = new A();
+  var c = b.async();
+}