Extract ResolutionWorldBuilderBase from ElementResolutionWorldBuilder

pkg/compiler/lib/src/universe/world_builder.dart

 // Copyright (c) 2012, 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 world_builder;
 
 import 'dart:collection';
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
@@ skipping 17 matching lines @@
 import 'use.dart'
     show
         ConstantUse,
         ConstantUseKind,
         DynamicUse,
         DynamicUseKind,
         StaticUse,
         StaticUseKind;
 
 part 'codegen_world_builder.dart';
+part 'element_world_builder.dart';
 part 'member_usage.dart';
 part 'resolution_world_builder.dart';
 
 /// The known constraint on receiver for a dynamic call site.
 ///
 /// This can for instance be used to constrain this dynamic call to `foo` to
 /// 'receivers of the exact instance `Bar`':
 ///
 ///     class Bar {
 ///        void foo() {}
@@ skipping 126 matching lines @@
 
   /// All directly instantiated types, that is, the types of the directly
   /// instantiated classes.
   // TODO(johnniwinther): Improve semantic precision.
   Iterable<InterfaceType> get instantiatedTypes;
 
   /// Registers that [type] is checked in this world builder. The unaliased type
   /// is returned.
   void registerIsCheck(DartType type);
 }