Fix summarization of generic redirecting constructors.

pkg/analyzer/lib/src/summary/summarize_elements.dart

 // Copyright (c) 2015, 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 serialization.elements;
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/type.dart';
@@ skipping 525 matching lines @@
       }
     } else if (executableElement is ConstructorElementImpl) {
       b.kind = UnlinkedExecutableKind.constructor;
       b.isConst = executableElement.isConst;
       b.isFactory = executableElement.isFactory;
       if (executableElement.redirectedConstructor != null) {
         b.isRedirectedConstructor = true;
         if (executableElement.isFactory) {
           EntityRefBuilder typeRef = serializeTypeRef(
               executableElement.redirectedConstructor.enclosingElement.type,
-              executableElement);
+              executableElement.redirectedConstructor.enclosingElement);
           if (executableElement.redirectedConstructor.name.isNotEmpty) {
             String name = executableElement.redirectedConstructor.name;
             int typeId = typeRef.reference;
             LinkedReference typeLinkedRef = linkedReferences[typeId];
             unlinkedReferences.add(new UnlinkedReferenceBuilder(
                 name: name, prefixReference: typeId));
             int refId = linkedReferences.length;
             linkedReferences.add(new LinkedReferenceBuilder(
                 kind: ReferenceKind.constructor, unit: typeLinkedRef.unit));
             b.redirectedConstructor = new EntityRefBuilder(
@@ skipping 722 matching lines @@
       exportNames.add(new LinkedExportNameBuilder(
           name: name,
           dependency: serializeDependency(dependentLibrary),
           unit: unit,
           kind: kind));
     }
     pb.exportNames = exportNames;
     return pb;
   }
 }