Fix Instantiation equivalence

pkg/compiler/lib/src/universe/element_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;
 
 /// [ResolutionEnqueuerWorldBuilder] based on the [Element] model.
 class ElementResolutionWorldBuilder extends ResolutionWorldBuilderBase {
   /// Used for testing the new more precise computation of instantiated types
   /// and classes.
@@ skipping 46 matching lines @@
             if (instance.isRedirection) {
               continue;
             }
             if (constructor == null || !constructor.isRedirectingFactory) {
               infoFor(cls)
                   .addInstantiation(constructor, instance.type, instance.kind);
             } else {
               ConstructorElement target = constructor.effectiveTarget;
               ResolutionInterfaceType targetType =
                   constructor.computeEffectiveTargetType(instance.type);
-              Instantiation kind = Instantiation.DIRECTLY_INSTANTIATED;
-              if (target.enclosingClass.isAbstract) {
-                // If target is a factory constructor on an abstract class.
+              ClassElement cls = target.enclosingClass;
+              bool isNative = _nativeBasicData.isNativeClass(cls);
+              Instantiation kind;
+              if (isNative) {
+                kind = Instantiation.ABSTRACTLY_INSTANTIATED;
+              } else if (cls.isAbstract) {
                 kind = Instantiation.UNINSTANTIATED;
+              } else {
+                kind = Instantiation.DIRECTLY_INSTANTIATED;
               }
               infoFor(targetType.element)
                   .addInstantiation(target, targetType, kind);
             }
           }
         });
       }
     });
     return instantiationMap;
   }
@@ skipping 89 matching lines @@
         classSets: _classSets);
   }
 
   @override
   void registerMixinUse(
       MixinApplicationElement mixinApplication, ClassElement mixin) {
     assert(mixin.isDeclaration);
     super.registerMixinUse(mixinApplication, mixin);
   }
 }