Add types referenced in is-checks to the class hierarchy

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

 // Copyright (c) 2017, 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.
 
 part of world_builder;
 
 abstract class ResolutionWorldBuilder implements WorldBuilder, OpenWorld {
   /// Set of all local functions in the program. Used by the mirror tracking
   /// system to find all live closure instances.
   Iterable<Local> get localFunctions;
@@ skipping 926 matching lines @@
         superclass = getSuperClass(superclass);
       }
     }
 
     // Use the [:seenClasses:] set to include non-instantiated
     // classes: if the superclass of these classes require RTI, then
     // they also need RTI, so that a constructor passes the type
     // variables to the super constructor.
     forEachInstantiatedClass(addSubtypes);
 
+    void _registerType(DartType type) {

[Johnni Winther, 2017/09/01 08:21:34]

We probably need to visit function types and typedefs as well. Implement this as
a DartTypeVisitor instead of a recusive function.

[Harry Terkelsen, 2017/09/01 18:48:24]

Done.

+      if (type.isInterfaceType) {
+        InterfaceType interface = type;
+        _ensureClassSet(interface.element);
+        interface.typeArguments.forEach(_registerType);
+      }
+    }
+
+    isChecks.forEach(_registerType);
+
     _classHierarchyNodes.keys.toList().forEach(_ensureClassSet);
 
     return typesImplementedBySubclasses;
   }
 
   Iterable<MemberEntity> computeAssignedInstanceMembers() {
     Set<MemberEntity> assignedInstanceMembers = new Set<MemberEntity>();
     for (MemberEntity instanceMember in _liveInstanceMembers) {
       if (hasInvokedSetter(instanceMember)) {
         assignedInstanceMembers.add(instanceMember);
@@ skipping 66 matching lines @@
         typesImplementedBySubclasses: typesImplementedBySubclasses,
         classHierarchyNodes: _classHierarchyNodes,
         classSets: _classSets);
   }
 
   @override
   void registerClass(ClassEntity cls) {
     throw new UnimplementedError('KernelResolutionWorldBuilder.registerClass');
   }
 }