Assert that we don't mix K and J elements

pkg/compiler/lib/src/js_emitter/code_emitter_task.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 dart2js.js_emitter.code_emitter_task;
 
 import 'package:js_runtime/shared/embedded_names.dart' show JsBuiltin;
 
 import '../common.dart';
 import '../common/tasks.dart' show CompilerTask;
@@ skipping 182 matching lines @@
           closedWorld.elementEnvironment,
           closedWorld.commonElements,
           closedWorld.dartTypes,
           compiler.deferredLoadTask,
           compiler.backendStrategy.closureDataLookup,
           compiler.codegenWorldBuilder,
           backend.nativeCodegenEnqueuer,
           closedWorld.backendUsage,
           backend.constants,
           closedWorld.nativeData,
-          backend.rtiNeed,
+          closedWorld.rtiNeed,
           backend.mirrorsData,
           closedWorld.interceptorData,
           backend.superMemberData,
           typeTestRegistry.rtiChecks,
           backend.rtiEncoder,
           backend.rtiSubstitutions,
           backend.jsInteropAnalysis,
           backend.oneShotInterceptorData,
           backend.customElementsCodegenAnalysis,
           backend.generatedCode,
@@ skipping 119 matching lines @@
   @override
   jsAst.Expression interceptorClassAccess(ClassEntity element) {
     return globalPropertyAccessForClass(element);
   }
 
   @override
   jsAst.Expression typeAccess(Entity element) {
     return globalPropertyAccessForType(element);
   }
 }