Use entities in impact transformers.

pkg/compiler/lib/src/ssa/codegen.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.
 
 import 'dart:math' as math;
 import 'dart:collection' show Queue;
 import '../common.dart';
 import '../common/codegen.dart' show CodegenRegistry, CodegenWorkItem;
 import '../common/tasks.dart' show CompilerTask;
 import '../constants/constant_system.dart';
@@ skipping 84 matching lines @@
       return new js.Fun(codegen.parameters, codegen.body)
           .withSourceInformation(sourceInformation);
     });
   }
 
   js.Expression generateMethod(
       CodegenWorkItem work, HGraph graph, ClosedWorld closedWorld) {
     return measure(() {
       MethodElement element = work.element;
       if (element.asyncMarker != AsyncMarker.SYNC) {
-        work.registry.registerAsyncMarker(element);
+        work.registry.registerAsyncMarker(element.asyncMarker);
       }
       SsaCodeGenerator codegen = new SsaCodeGenerator(
           backend.compiler.options,
           backend.emitter,
           backend.nativeCodegenEnqueuer,
           backend.helpers,
           backend.checkedModeHelpers,
           backend.nativeData,
           backend.interceptorData,
           backend.oneShotInterceptorData,
@@ skipping 2915 matching lines @@
     return _closedWorld.anyStrictSubclassOf(cls, (ClassEntity subclass) {
       return !_rtiSubstitutions.isTrivialSubstitution(subclass, cls);
     });
   }
 
   @override
   void visitRef(HRef node) {
     visit(node.value);
   }
 }