Introduce instance type for transition arrays.

src/heap/object-stats.cc

Index: src/heap/object-stats.cc
diff --git a/src/heap/object-stats.cc b/src/heap/object-stats.cc
index 195723e86d8526e7e75abee45d402f16f7c78a55..c1566abfc5cf6accc1a20fc666310b57d0951c3b 100644
--- a/src/heap/object-stats.cc
+++ b/src/heap/object-stats.cc
@@ -186,12 +186,6 @@ void ObjectStatsVisitor::Visit<ObjectStatsVisitor::kVisitMap>(Map* map,
     heap->object_stats_->RecordFixedArraySubTypeStats(DESCRIPTOR_ARRAY_SUB_TYPE,
                                                       fixed_array_size);
   }
-  if (TransitionArray::IsFullTransitionArray(map_obj->raw_transitions())) {
-    int fixed_array_size =
-        TransitionArray::cast(map_obj->raw_transitions())->Size();
-    heap->object_stats_->RecordFixedArraySubTypeStats(TRANSITION_ARRAY_SUB_TYPE,
-                                                      fixed_array_size);
-  }
   if (map_obj->has_code_cache()) {
     CodeCache* cache = CodeCache::cast(map_obj->code_cache());
     heap->object_stats_->RecordFixedArraySubTypeStats(