Handle redirecting constructors to DillMemberBuilder.

pkg/front_end/lib/src/fasta/kernel/kernel_class_builder.dart

 // Copyright (c) 2016, 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 fasta.kernel_class_builder;
 
 import 'package:kernel/ast.dart' show
     Class,
     DartType,
     ExpressionStatement,
@@ skipping 14 matching lines @@
     ClassBuilder,
     ConstructorReferenceBuilder,
     KernelProcedureBuilder,
     KernelTypeBuilder,
     LibraryBuilder,
     MetadataBuilder,
     ProcedureBuilder,
     TypeVariableBuilder,
     computeDefaultTypeArguments;
 
+import '../dill/dill_member_builder.dart' show
+    DillMemberBuilder;
+
 import 'redirecting_factory_body.dart' show
     RedirectingFactoryBody;
 
 abstract class KernelClassBuilder
     extends ClassBuilder<KernelTypeBuilder, InterfaceType> {
   KernelClassBuilder(
       List<MetadataBuilder> metadata, int modifiers,
       String name, List<TypeVariableBuilder> typeVariables,
       KernelTypeBuilder supertype, List<KernelTypeBuilder> interfaces,
       Map<String, Builder> members, LibraryBuilder parent, int charOffset)
@@ skipping 53 matching lines @@
         if (builder is KernelProcedureBuilder && builder.isFactory) {
           // Compute the immediate redirection target, not the effective.
           ConstructorReferenceBuilder redirectionTarget =
               builder.redirectionTarget;
           if (redirectionTarget != null) {
             assert(builder.actualBody == null);
             Builder targetBuilder = redirectionTarget.target;
             if (targetBuilder is ProcedureBuilder) {
               Member target = targetBuilder.target;
               builder.body = new RedirectingFactoryBody(target);
+            } else if (targetBuilder is DillMemberBuilder) {
+              builder.body = new RedirectingFactoryBody(targetBuilder.member);
             } else {
               // TODO(ahe): Throw NSM error. This requires access to core
               // types.
               String message = "Redirection constructor target not found: "
                   "${redirectionTarget.fullNameForErrors}";
               warning(library.fileUri, -1, message);
               builder.body = new ExpressionStatement(
                   new Throw(new StringLiteral(message)));
             }
           }
         }
       });
     }
     return count;
   }
 }