Use entities in Selector methods

pkg/compiler/lib/src/universe/codegen_world_builder.dart

 // Copyright (c) 2017, 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 world_builder;
 
 /// World builder specific to codegen.
 ///
 /// This adds additional access to liveness of selectors and elements.
 abstract class CodegenWorldBuilder implements WorldBuilder {
@@ skipping 181 matching lines @@
       cls.allSupertypes.forEach((ResolutionInterfaceType supertype) {
         if (_implementedClasses.add(supertype.element)) {
           classUsed(
               supertype.element, _getClassUsage(supertype.element).implement());
         }
       });
     }
   }
 
   bool _hasMatchingSelector(Map<Selector, SelectorConstraints> selectors,
-      Element member, ClosedWorld world) {
+      MemberElement member, ClosedWorld world) {
     if (selectors == null) return false;
     for (Selector selector in selectors.keys) {
       if (selector.appliesUnnamed(member)) {
         SelectorConstraints masks = selectors[selector];
         if (masks.applies(member, selector, world)) {
           return true;
         }
       }
     }
     return false;
@@ skipping 184 matching lines @@
     }
     if (useSet.isNotEmpty) {
       memberUsed(usage.entity, useSet);
     }
   }
 
   void processClassMembers(ClassElement cls, MemberUsedCallback memberUsed) {
     cls.implementation.forEachMember((_, MemberElement member) {
       assert(invariant(member, member.isDeclaration));
       if (!member.isInstanceMember) return;
+      if (member.isMalformed) return;
       _getMemberUsage(member, memberUsed);
     });
   }
 
   _MemberUsage _getMemberUsage(
       MemberElement member, MemberUsedCallback memberUsed) {
     assert(invariant(member, member.isDeclaration));
     return _instanceMemberUsage.putIfAbsent(member, () {
       String memberName = member.name;
       ClassElement cls = member.enclosingClass;
@@ skipping 71 matching lines @@
 
   /// Register the constant [use] with this world builder. Returns `true` if
   /// the constant use was new to the world.
   bool registerConstantUse(ConstantUse use) {
     if (use.kind == ConstantUseKind.DIRECT) {
       _constants.addCompileTimeConstantForEmission(use.value);
     }
     return _constantValues.add(use.value);
   }
 }