Less inequivalence on Hello World!

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.
 
 library js_backend.backend;
 
 import '../common.dart';
 import '../common/backend_api.dart'
     show ForeignResolver, NativeRegistry, ImpactTransformer;
 import '../common/codegen.dart' show CodegenWorkItem;
@@ skipping 726 matching lines @@
   void onResolutionClosedWorld(
       ClosedWorld closedWorld, ClosedWorldRefiner closedWorldRefiner) {
     for (MemberEntity entity
         in compiler.enqueuer.resolution.processedEntities) {
       processAnnotations(closedWorld.elementEnvironment,
           closedWorld.commonElements, entity, closedWorldRefiner);
     }
     mirrorsDataBuilder.computeMembersNeededForReflection(
         compiler.enqueuer.resolution.worldBuilder, closedWorld);
     _rtiNeed = rtiNeedBuilder.computeRuntimeTypesNeed(
-        compiler.enqueuer.resolution.worldBuilder, closedWorld, compiler.types,
+        compiler.enqueuer.resolution.worldBuilder,
+        closedWorld,
+        compiler.frontendStrategy.dartTypes,
         enableTypeAssertions: compiler.options.enableTypeAssertions);
     mirrorsResolutionAnalysis.onResolutionComplete();
   }
 
   void onTypeInferenceComplete(GlobalTypeInferenceResults results) {
     noSuchMethodRegistry.onTypeInferenceComplete(results);
   }
 
   /// Called when resolving a call to a foreign function.
   native.NativeBehavior resolveForeignCall(Send node, Element element,
@@ skipping 639 matching lines @@
 
   bool canUseAliasedSuperMember(MemberEntity member, Selector selector) {
     return !selector.isGetter;
   }
 
   /// Returns `true` if [member] is called from a subclass via `super`.
   bool isAliasedSuperMember(MemberEntity member) {
     return _aliasedSuperMembers.contains(member);
   }
 }