Reuse RuntimeTypesNeedBuilderImpl and _RuntimeTypesNeed for kernel based elements

pkg/compiler/lib/src/universe/resolution_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;
 
 abstract class ResolutionWorldBuilder implements WorldBuilder, OpenWorld {
   /// Set of all local functions in the program. Used by the mirror tracking
   /// system to find all live closure instances.
   Iterable<Local> get localFunctions;
@@ skipping 694 matching lines @@
     _instanceMemberUsage.putIfAbsent(member, () {
       bool isNative = _nativeBasicData.isNativeClass(cls);
       _MemberUsage usage = new _MemberUsage(member, isNative: isNative);
       EnumSet<MemberUse> useSet = new EnumSet<MemberUse>();
       useSet.addAll(usage.appliedUse);
       if (member.isField && isNative) {
         registerUsedElement(member);
       }
       if (member.isFunction &&
           member.name == Identifiers.call &&
-          _elementEnvironment.getThisType(cls).typeArguments.isNotEmpty) {
+          _elementEnvironment.isGenericClass(cls)) {
         closurizedMembersWithFreeTypeVariables.add(member);
       }
 
       if (_hasInvokedGetter(member)) {
         useSet.addAll(usage.read());
       }
       if (_hasInvocation(member)) {
         useSet.addAll(usage.invoke());
       }
       if (hasInvokedSetter(member)) {
@@ skipping 213 matching lines @@
         typesImplementedBySubclasses: typesImplementedBySubclasses,
         classHierarchyNodes: _classHierarchyNodes,
         classSets: _classSets);
   }
 
   @override
   void registerClass(ClassEntity cls) {
     throw new UnimplementedError('KernelResolutionWorldBuilder.registerClass');
   }
 }