Do not resolve the selector to find the getter, but the receiver instead.

frog/tests/leg_only/src/GetterElementTest.dart

+// Copyright (c) 2011, 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 A {
+  static main() {
+    testOther();
+    new A().testSelf();
+  }
+
+  static testOther() {
+    var o = new A();
+    o.instf = 0;
+    o.instf += 1;
+    Expect.equals(1, o.instf);
+  }
+
+  testSelf() {
+    instf = 0;
+    instf += 1;
+    Expect.equals(1, instf);
+  }
+
+  var instf;
+}
+
+main() {
+  A.main();
+}