Allow private selectors to be typed, and fix ClassElement.isSubclassOf to take patches into account.

sdk/lib/_internal/compiler/implementation/elements/modelx.dart

 // Copyright (c) 2013, 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.
 
 library elements.modelx;
 
 import 'dart:uri';
 
 import 'elements.dart';
 import '../../compiler.dart' as api;
@@ skipping 1682 matching lines @@
   }
 
   /**
    * Returns true if [this] is a subclass of [cls].
    *
    * This method is not to be used for checking type hierarchy and
    * assignments, because it does not take parameterized types into
    * account.
    */
   bool isSubclassOf(ClassElement cls) {
-    for (ClassElement s = this; s != null; s = s.superclass) {
+    // Use [declaration] for both [this] and [cls], because
+    // declaration classes hold the superclass hierarchy.
+    cls = cls.declaration;
+    for (ClassElement s = declaration; s != null; s = s.superclass) {
       if (identical(s, cls)) return true;
     }
     return false;
   }
 
   bool isInterface() => false;
   bool isNative() => nativeTagInfo != null;
   void setNative(String name) {
     nativeTagInfo = new SourceString(name);
   }
@@ skipping 255 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }