Reland "[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 2b0234dd0b9891cbf698d344be1d185231e4556a..4fa30e2650890945097555663006d63f86040512 100644
--- a/src/heap/scavenger.cc
+++ b/src/heap/scavenger.cc
@@ -295,14 +295,6 @@ class ScavengingVisitor : public StaticVisitorBase {
                                            PromotionMode promotion_mode) {
     ObjectEvacuationStrategy<POINTER_OBJECT>::Visit(map, slot, object,
                                                     promotion_mode);
-
-    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));
-    }
   }
 
   static inline void EvacuateByteArray(Map* map, HeapObject** slot,