Assert that we don't mix K and J elements

pkg/compiler/lib/src/native/enqueue.dart

 // Copyright (c) 2014, 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 '../common_elements.dart' show CommonElements, ElementEnvironment;
 import '../elements/entities.dart';
 import '../elements/types.dart';
 import '../js_backend/backend_usage.dart' show BackendUsageBuilder;
 import '../js_backend/native_data.dart' show NativeData;
 import '../js_emitter/js_emitter.dart' show CodeEmitterTask, NativeEmitter;
@@ skipping 185 matching lines @@
       CommonElements commonElements,
       DartTypes dartTypes,
       this._backendUsageBuilder,
       this._nativeClassFinder)
       : super(options, elementEnvironment, commonElements, dartTypes);
 
   Iterable<ClassEntity> get nativeClassesForTesting => _nativeClasses;
 
   Iterable<ClassEntity> get registeredClassesForTesting => _registeredClasses;
 
+  Iterable<ClassEntity> get liveNativeClasses => _registeredClasses;
+
   void _registerBackendUse(FunctionEntity element) {
     _backendUsageBuilder.registerBackendFunctionUse(element);
     _backendUsageBuilder.registerGlobalFunctionDependency(element);
   }
 
   WorldImpact processNativeClasses(Iterable<LibraryEntity> libraries) {
     WorldImpactBuilderImpl impactBuilder = new WorldImpactBuilderImpl();
     Iterable<ClassEntity> nativeClasses =
         _nativeClassFinder.computeNativeClasses(libraries);
     _nativeClasses.addAll(nativeClasses);
     _unusedClasses.addAll(nativeClasses);
     if (!enableLiveTypeAnalysis) {
       _registerTypeUses(impactBuilder, _nativeClasses, 'forced');
     }
     return impactBuilder;
   }
 
   void logSummary(void log(String message)) {
     super.logSummary(log);
     log('Resolved ${_registeredClasses.length} native elements used, '
         '${_unusedClasses.length} native elements dead.');
   }
 }
 
 class NativeCodegenEnqueuer extends NativeEnqueuerBase {
   final CodeEmitterTask _emitter;
-  final NativeResolutionEnqueuer _resolutionEnqueuer;
+  final Iterable<ClassEntity> _nativeClasses;
   final NativeData _nativeData;
 
   final Set<ClassEntity> _doneAddSubtypes = new Set<ClassEntity>();
 
   NativeCodegenEnqueuer(
       CompilerOptions options,
       ElementEnvironment elementEnvironment,
       CommonElements commonElements,
       DartTypes dartTypes,
       this._emitter,
-      this._resolutionEnqueuer,
+      this._nativeClasses,
       this._nativeData)
       : super(options, elementEnvironment, commonElements, dartTypes);
 
   WorldImpact processNativeClasses(Iterable<LibraryEntity> libraries) {
     WorldImpactBuilderImpl impactBuilder = new WorldImpactBuilderImpl();
-    _unusedClasses.addAll(_resolutionEnqueuer._nativeClasses);
+    _unusedClasses.addAll(_nativeClasses);
 
     if (!enableLiveTypeAnalysis) {
-      _registerTypeUses(
-          impactBuilder, _resolutionEnqueuer._nativeClasses, 'forced');
+      _registerTypeUses(impactBuilder, _nativeClasses, 'forced');
     }
 
     // HACK HACK - add all the resolved classes.
     Set<ClassEntity> matchingClasses = new Set<ClassEntity>();
-    for (ClassEntity classElement in _resolutionEnqueuer._registeredClasses) {
+    for (ClassEntity classElement in _nativeClasses) {
       if (_unusedClasses.contains(classElement)) {
         matchingClasses.add(classElement);
       }
     }
     if (matchingClasses.isNotEmpty && _registeredClasses.isEmpty) {
       matchingClasses.addAll(_onFirstNativeClass(impactBuilder));
     }
     _registerTypeUses(impactBuilder, matchingClasses, 'was resolved');
     return impactBuilder;
   }
@@ skipping 38 matching lines @@
         emitter.directSubtypes.putIfAbsent(superclass, () => <ClassEntity>[]);
     directSubtypes.add(cls);
   }
 
   void logSummary(void log(String message)) {
     super.logSummary(log);
     log('Compiled ${_registeredClasses.length} native classes, '
         '${_unusedClasses.length} native classes omitted.');
   }
 }