Add KernelCodegenWorkItem stub

pkg/compiler/lib/src/js_backend/codegen_listener.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.
 
 library js_backend.backend.codegen_listener;
 
 import '../common/names.dart' show Identifiers;
 import '../common_elements.dart' show CommonElements, ElementEnvironment;
 import '../constants/values.dart';
 import '../elements/elements.dart';
@@ skipping 225 matching lines @@
   }
 
   @override
   WorldImpact registerUsedConstant(ConstantValue constant) {
     WorldImpactBuilderImpl impactBuilder = new WorldImpactBuilderImpl();
     _computeImpactForCompileTimeConstant(constant, impactBuilder);
     return impactBuilder;
   }
 
   @override
-  WorldImpact registerUsedElement(MemberElement member) {
+  WorldImpact registerUsedElement(MemberEntity member) {
     WorldImpactBuilderImpl worldImpact = new WorldImpactBuilderImpl();
     _customElementsAnalysis.registerStaticUse(member);
 
     if (member.isFunction && member.isInstanceMember) {
-      MethodElement method = member;
-      ClassElement cls = method.enclosingClass;
-      if (method.name == Identifiers.call &&
-          !cls.typeVariables.isEmpty &&
-          _rtiNeed.methodNeedsRti(method)) {
+      ClassEntity cls = member.enclosingClass;
+      if (member.name == Identifiers.call &&
+          _elementEnvironment.isGenericClass(cls) &&
+          _rtiNeed.methodNeedsRti(member)) {
         worldImpact.addImpact(_registerComputeSignature());
       }
     }
 
     return worldImpact;
   }
 
   WorldImpact _processClass(ClassElement cls) {
     WorldImpactBuilderImpl impactBuilder = new WorldImpactBuilderImpl();
     if (!cls.typeVariables.isEmpty) {
@@ skipping 73 matching lines @@
   WorldImpact registerInstantiatedClass(ClassEntity cls) {
     return _processClass(cls);
   }
 
   @override
   void logSummary(void log(String message)) {
     _lookupMapAnalysis.logSummary(log);
     _nativeEnqueuer.logSummary(log);
   }
 }