Forget aliasedSuperMembers.

dart/pkg/compiler/lib/src/js_backend/backend.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 js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 const bool USE_CPS_IR = const bool.fromEnvironment("USE_CPS_IR");
 
@@ skipping 2243 matching lines @@
 
   FunctionElement helperForMissingMain() => findHelper('missingMain');
 
   FunctionElement helperForMainArity() {
     return findHelper('mainHasTooManyParameters');
   }
 
   void forgetElement(Element element) {
     constants.forgetElement(element);
     constantCompilerTask.dartConstantCompiler.forgetElement(element);
+    aliasedSuperMembers.remove(element);
   }
 
   void registerMainHasArguments(Enqueuer enqueuer) {
     // If the main method takes arguments, this compilation could be the target
     // of Isolate.spawnUri. Strictly speaking, that can happen also if main
     // takes no arguments, but in this case the spawned isolate can't
     // communicate with the spawning isolate.
     enqueuer.enableIsolateSupport();
   }
 }
@@ skipping 195 matching lines @@
   }
 }
 
 /// Records that [constant] is used by the element behind [registry].
 class Dependency {
   final ConstantValue constant;
   final Element annotatedElement;
 
   const Dependency(this.constant, this.annotatedElement);
 }