[heap] Fine-grained JSArrayBuffer tracking

src/heap/scavenger.cc

Index: src/heap/scavenger.cc
diff --git a/src/heap/scavenger.cc b/src/heap/scavenger.cc
index 1d785d08d24232388be4d45603d68f9da313c22a..51968c3990b23f1916a773917b17d801052071f8 100644
--- a/src/heap/scavenger.cc
+++ b/src/heap/scavenger.cc
@@ -289,14 +289,6 @@ class ScavengingVisitor : public StaticVisitorBase {
   static inline void EvacuateJSArrayBuffer(Map* map, HeapObject** slot,
                                            HeapObject* object) {
     ObjectEvacuationStrategy<POINTER_OBJECT>::Visit(map, slot, object);
-
-    Heap* heap = map->GetHeap();
-    MapWord map_word = object->map_word();
-    DCHECK(map_word.IsForwardingAddress());
-    HeapObject* target = map_word.ToForwardingAddress();
-    if (!heap->InNewSpace(target)) {
-      heap->array_buffer_tracker()->Promote(JSArrayBuffer::cast(target));
-    }
   }