Enqueue superclasses instead of supertypes.

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.
 
 library dart2js.enqueue;
 
 import 'dart:collection' show
     Queue;
 
 import 'common/names.dart' show
@@ skipping 176 matching lines @@
     worldImpact.closurizedFunctions.forEach(registerGetOfStaticFunction);
   }
 
   // TODO(johnniwinther): Remove the need for passing the [registry].
   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);
+      universe.registerTypeInstantiation(
+          type,
+          byMirrors: mirrorUsage,
+          onImplemented: (ClassElement cls) {
+        compiler.backend.registerImplementedClass(
+                    cls, this, compiler.globalDependencies);
+      });
       processInstantiatedClass(cls);
       compiler.backend.registerInstantiatedType(type, registry);
     });
   }
 
   bool checkNoEnqueuedInvokedInstanceMethods() {
     return filter.checkNoEnqueuedInvokedInstanceMethods(this);
   }
 
   void processInstantiatedClassMembers(ClassElement cls) {
@@ skipping 121 matching lines @@
         cls.implementation.forEachMember(processInstantiatedClassMember);
         if (isResolutionQueue && !cls.isSynthesized) {
           compiler.resolver.checkClass(cls);
         }
         // We only tell the backend once that [cls] was instantiated, so
         // any additional dependencies must be treated as global
         // dependencies.
         compiler.backend.registerInstantiatedClass(
             cls, this, compiler.globalDependencies);
       }
-      processClass(cls);
-      for (Link<DartType> supertypes = cls.allSupertypes;
-           !supertypes.isEmpty; supertypes = supertypes.tail) {
-        processClass(supertypes.head.element);
+      while (cls != null) {
+        processClass(cls);
+        cls = cls.superclass;
       }
     });
   }
 
   void registerInvocation(UniverseSelector selector) {
     task.measure(() {
       if (universe.registerInvocation(selector)) {
         handleUnseenSelector(selector);
       }
     });
@@ skipping 716 matching lines @@
   @override
   void processStaticUse(Enqueuer enqueuer, Element element) {
     enqueuer.registerStaticUseInternal(element);
   }
 
   @override
   void processSelector(Enqueuer enqueuer, UniverseSelector selector) {
     enqueuer.handleUnseenSelectorInternal(selector);
   }
 }