Remove descriptors pointer.

src/objects-visiting-inl.h

Index: src/objects-visiting-inl.h
diff --git a/src/objects-visiting-inl.h b/src/objects-visiting-inl.h
index 5d33e2ef98e66754715066102e3f7ea7131782c5..3d4f1daba40f9eea5df0695b4f4bdcf1fc8c0d6d 100644
--- a/src/objects-visiting-inl.h
+++ b/src/objects-visiting-inl.h
@@ -328,7 +328,11 @@ void StaticMarkingVisitor<StaticVisitor>::MarkTransitionArray(
 
   // Skip recording the descriptors_pointer slot since the cell space
   // is not compacted and descriptors are referenced through a cell.
-  StaticVisitor::MarkObject(heap, transitions->descriptors_pointer());
+  Object** descriptors_slot = transitions->GetDescriptorsSlot();
+  HeapObject* descriptors = HeapObject::cast(*descriptors_slot);
+  StaticVisitor::MarkObject(heap, descriptors);
+  heap->mark_compact_collector()->RecordSlot(
+      descriptors_slot, descriptors_slot, descriptors);
 
   // Simple transitions do not have keys nor prototype transitions.
   if (transitions->IsSimpleTransition()) return;