Pass ClassHierarchy instead of creating it.

pkg/front_end/lib/src/fasta/kernel/kernel_target.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_target;
 
 import 'dart:async' show Future;
 
 import 'dart:io' show File;
 
@@ skipping 641 matching lines @@
   }
 
   /// Run all transformations that are needed when building a program for the
   /// first time.
   void runBuildTransformations() {
     transformMixinApplications();
     otherTransformations();
   }
 
   void transformMixinApplications() {
-    mix.transformLibraries(backendTarget, loader.coreTypes, loader.libraries);
+    mix.transformLibraries(
+        backendTarget, loader.coreTypes, loader.hierarchy, loader.libraries);
     ticker.logMs("Transformed mixin applications");
   }
 
   void otherTransformations() {
     // TODO(ahe): Don't generate type variables in the first place.
     if (!strongMode) {
       _program.accept(new Erasure());
       ticker.logMs("Erased type variables in generic methods");
     }
     // TODO(kmillikin): Make this run on a per-method basis.
@@ skipping 45 matching lines @@
   }
   for (Constructor constructor in superclass.constructors) {
     if (constructor.name.name.isEmpty) {
       return constructor.function.requiredParameterCount == 0
           ? constructor
           : null;
     }
   }
   return null;
 }