Use MemberElement instead of Element in function sets and selectors.

pkg/compiler/lib/src/world.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.world;
 
 import 'closure.dart' show ClosureClassElement, SynthesizedCallMethodElementX;
 import 'common/backend_api.dart' show BackendClasses;
 import 'common.dart';
 import 'constants/constant_system.dart';
@@ skipping 1050 matching lines @@
 
   void registerSideEffectsFree(Element element) {
     sideEffects[element.declaration] = new SideEffects.empty();
     sideEffectsFreeElements.add(element);
   }
 
   SideEffects getSideEffectsOfSelector(Selector selector, TypeMask mask) {
     // We're not tracking side effects of closures.
     if (selector.isClosureCall) return new SideEffects();
     SideEffects sideEffects = new SideEffects.empty();
-    for (Element e in allFunctions.filter(selector, mask)) {
+    for (MemberElement e in allFunctions.filter(selector, mask)) {
       if (e.isField) {
         if (selector.isGetter) {
           if (!fieldNeverChanges(e)) {
             sideEffects.setDependsOnInstancePropertyStore();
           }
         } else if (selector.isSetter) {
           sideEffects.setChangesInstanceProperty();
         } else {
           assert(selector.isCall);
           sideEffects.setAllSideEffects();
@@ skipping 29 matching lines @@
       return getMightBePassedToApply(element.expression);
     }
     return functionsThatMightBePassedToApply.contains(element);
   }
 
   @override
   bool getCurrentlyKnownMightBePassedToApply(Element element) {
     return getMightBePassedToApply(element);
   }
 }