Extract OrderedTypeSetBuilderBase from OrderedTypeSetBuilder

pkg/compiler/lib/src/mirrors_used.dart

 // Copyright (c) 2013, 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 dart2js.mirrors_used;
 
 import 'common/tasks.dart' show CompilerTask;
 import 'common.dart';
 import 'compile_time_constants.dart' show ConstantCompiler;
 import 'compiler.dart' show Compiler;
@@ skipping 405 matching lines @@
   }
 
   /// Find the first non-implementation interface of constant.
   ResolutionDartType apiTypeOf(ConstantValue constant) {
     ResolutionDartType type = constant.getType(compiler.commonElements);
     LibraryElement library = type.element.library;
     if (type.isInterfaceType && library.isInternalLibrary) {
       ResolutionInterfaceType interface = type;
       ClassElement cls = type.element;
       cls.ensureResolved(compiler.resolution);
-      for (ResolutionDartType supertype in cls.allSupertypes) {
+      for (ResolutionInterfaceType supertype in cls.allSupertypes) {
         if (supertype.isInterfaceType &&
             !supertype.element.library.isInternalLibrary) {
           return interface.asInstanceOf(supertype.element);
         }
       }
     }
     return type;
   }
 
   /// Convert a list of strings and types to a list of elements. Types are
@@ skipping 129 matching lines @@
       // @MirrorsUsed(targets: fisk)
       //                       ^^^^
       //
       // Instead of saying 'fisk' should pretty print the problematic constant
       // value.
       return spannable;
     }
     return node;
   }
 }