fix a few more codegen issues:

test/codegen/language/naming3_test.dart

+// 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.
+
+import "package:expect/expect.dart";
+
+class A {
+  var __PROTO__ = 499;
+  var constructor = 1;
+  var prototype = 2;
+}
+
+// TODO(jmesserly): changed this test to avoid shadowing a field with a getter,
+// which DDC doesn't currently support, see:
+// https://github.com/dart-lang/dev_compiler/issues/52
+class A2 {
+  get __PROTO__ => 499;
+  get constructor => 1;
+  get prototype => 2;
+}
+
+class B extends A2 {
+  get __PROTO__ => 42;
+  get constructor => 3;
+  get prototype => 4;
+}
+
+main() {
+  var a = new A();
+  var a2 = new A2();
+  var b = new B();
+  var list = [a, a2, b];
+  for (int i = 0; i < list.length; i++) {
+    var proto = list[i].__PROTO__;
+    var constructor = list[i].constructor;
+    var prototype = list[i].prototype;
+    if (i < 2) {
+      Expect.equals(499, proto);
+      Expect.equals(1, constructor);
+      Expect.equals(2, prototype);
+    } else {
+      Expect.equals(42, proto);
+      Expect.equals(3, constructor);
+      Expect.equals(4, prototype);
+    }
+  }
+}