Support user class in compile_from_dill_test

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;
 import '../common/names.dart' show Uris;
 import '../common/resolution.dart' show Resolution, Target;
 import '../common/tasks.dart' show CompilerTask;
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/expressions.dart';
 import '../constants/values.dart';
 import '../common_elements.dart' show CommonElements;
 import '../deferred_load.dart' show DeferredLoadTask;
 import '../dump_info.dart' show DumpInfoTask;
 import '../elements/elements.dart';
 import '../elements/entities.dart';
 import '../elements/names.dart';
 import '../elements/resolution_types.dart';
+import '../elements/types.dart';
 import '../enqueue.dart'
     show
         DirectEnqueuerStrategy,
         Enqueuer,
         EnqueueTask,
         ResolutionEnqueuer,
         TreeShakingEnqueuerStrategy;
 import '../frontend_strategy.dart';
 import '../io/source_information.dart' show SourceInformationStrategy;
 import '../js/js.dart' as jsAst;
@@ skipping 965 matching lines @@
       }
       reporter.reportHint(hint, infos);
     }
     return programSize;
   }
 
   /**
    * Returns [:true:] if the checking of [type] is performed directly on the
    * object and not on an interceptor.
    */
-  bool hasDirectCheckFor(ResolutionDartType type) {
-    Element element = type.element;
+  bool hasDirectCheckFor(DartType type) {
+    if (!type.isInterfaceType) return false;
+    InterfaceType interfaceType = type;
+    ClassEntity element = interfaceType.element;
     return element == commonElements.stringClass ||
         element == commonElements.boolClass ||
         element == commonElements.numClass ||
         element == commonElements.intClass ||
         element == commonElements.doubleClass ||
         element == commonElements.jsArrayClass ||
         element == commonElements.jsMutableArrayClass ||
         element == commonElements.jsExtendableArrayClass ||
         element == commonElements.jsFixedArrayClass ||
         element == commonElements.jsUnmodifiableArrayClass;
@@ skipping 372 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);
   }
 }