Enable top level inference of instance property gets/sets.

pkg/front_end/testcases/inference_new/infer_instance_field_ref_circular.dart

Index: pkg/front_end/testcases/inference_new/infer_instance_field_ref_circular.dart
diff --git a/pkg/front_end/testcases/inference_new/infer_instance_field_ref_circular.dart b/pkg/front_end/testcases/inference_new/infer_instance_field_ref_circular.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b83ee3a494549f2daa40db14e24db9a93c45c123
--- /dev/null
+++ b/pkg/front_end/testcases/inference_new/infer_instance_field_ref_circular.dart
@@ -0,0 +1,21 @@
+// Copyright (c) 2017, 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.
+
+/*@testedFeatures=inference*/
+library test;
+
+// In the code below, there is a circularity between A.b and x.
+
+class A {
+  var /*@topType=dynamic*/ b = /*@returnType=dynamic*/ () => x;
+  var /*@topType=() -> dynamic*/ c = /*@returnType=dynamic*/ () => x;
+}
+
+var /*@topType=A*/ a = new A();
+var /*@topType=dynamic*/ x = /*@returnType=dynamic*/ () =>
+    a. /*@target=A::b*/ b;
+var /*@topType=() -> () -> dynamic*/ y = /*@returnType=() -> dynamic*/ () =>
+    a. /*@target=A::c*/ c;
+
+main() {}