Avoid patching in dart2dart.

pkg/compiler/lib/src/enqueue.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.
 
 part of dart2js;
 
 typedef ItemCompilationContext ItemCompilationContextCreator();
 
 class EnqueueTask extends CompilerTask {
   final ResolutionEnqueuer resolution;
@@ skipping 74 matching lines @@
   bool internalAddToWorkList(Element element);
 
   void registerInstantiatedType(InterfaceType type, Registry registry,
                                 {bool mirrorUsage: false}) {
     task.measure(() {
       ClassElement cls = type.element;
       registry.registerDependency(cls);
       cls.ensureResolved(compiler);
       universe.registerTypeInstantiation(type, byMirrors: mirrorUsage);
       processInstantiatedClass(cls);
+      compiler.backend.registerInstantiatedType(type, registry);
     });
   }
 
   void registerInstantiatedClass(ClassElement cls, Registry registry,
                                  {bool mirrorUsage: false}) {
     cls.ensureResolved(compiler);
     registerInstantiatedType(cls.rawType, registry, mirrorUsage: mirrorUsage);
   }
 
   bool checkNoEnqueuedInvokedInstanceMethods() {
@@ skipping 791 matching lines @@
   void processWorkItem(void f(WorkItem work), WorkItem work) {
     f(work);
   }
 }
 
 void removeFromSet(Map<String, Set<Element>> map, Element element) {
   Set<Element> set = map[element.name];
   if (set == null) return;
   set.remove(element);
 }