Visit encountered JSWeakCollection list during scavenging.

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 057b8ae99ffc3651e80b729c6f96f9335cb342a3..ec7fd79a8d37d9db3dda2645c51c0e896c50cd6f 100644
--- a/src/objects-visiting-inl.h
+++ b/src/objects-visiting-inl.h
@@ -402,12 +402,11 @@ void StaticMarkingVisitor<StaticVisitor>::VisitWeakCollection(
   Heap* heap = map->GetHeap();
   JSWeakCollection* weak_collection =
       reinterpret_cast<JSWeakCollection*>(object);
-  MarkCompactCollector* collector = heap->mark_compact_collector();
 
   // Enqueue weak collection in linked list of encountered weak collections.
   if (weak_collection->next() == heap->undefined_value()) {
-    weak_collection->set_next(collector->encountered_weak_collections());
-    collector->set_encountered_weak_collections(weak_collection);
+    weak_collection->set_next(heap->encountered_weak_collections());
+    heap->set_encountered_weak_collections(weak_collection);
   }
 
   // Skip visiting the backing hash table containing the mappings and the