All strong mode cleaning of dart2js.

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 56 matching lines @@
           ConstructorElement constructor = _constructor;
           for (Instance instance in set) {
             if (instance.isRedirection) {
               continue;
             }
             if (constructor == null || !constructor.isRedirectingFactory) {
               infoFor(cls)
                   .addInstantiation(constructor, instance.type, instance.kind);
             } else {
               ConstructorElement target = constructor.effectiveTarget;
-              ResolutionInterfaceType targetType =
+              ResolutionDartType targetType =
                   constructor.computeEffectiveTargetType(instance.type);
               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);
+              if (targetType is ResolutionInterfaceType) {
+                infoFor(targetType.element)
+                    .addInstantiation(target, targetType, kind);
+              }
             }
           }
         });
       }
     });
     return instantiationMap;
   }
 
   void registerIsCheck(ResolutionDartType type) {
     type.computeUnaliased(_resolution);
@@ skipping 88 matching lines @@
         classSets: _classSets);
   }
 
   @override
   void registerMixinUse(
       MixinApplicationElement mixinApplication, ClassElement mixin) {
     assert(mixin.isDeclaration);
     super.registerMixinUse(mixinApplication, mixin);
   }
 }