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 7fba1da3bb9e60b11b0c9c7d61143b6130f482b9..ab0848a4c0c82f6cfa245dcb3e3ecf916ab5b317 100644
--- a/src/heap/scavenger.cc
+++ b/src/heap/scavenger.cc
@@ -36,7 +36,8 @@ class ScavengingVisitor : public StaticVisitorBase {
     table_.Register(kVisitFixedDoubleArray, &EvacuateFixedDoubleArray);
     table_.Register(kVisitFixedTypedArray, &EvacuateFixedTypedArray);
     table_.Register(kVisitFixedFloat64Array, &EvacuateFixedFloat64Array);
-    table_.Register(kVisitJSArrayBuffer, &EvacuateJSArrayBuffer);
+    table_.Register(kVisitJSArrayBuffer,
+                    &ObjectEvacuationStrategy<POINTER_OBJECT>::Visit);
 
     table_.Register(
         kVisitNativeContext,
@@ -281,19 +282,6 @@ class ScavengingVisitor : public StaticVisitorBase {
                                                    object_size);
   }
 
-  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));
-    }
-  }
-
   static inline void EvacuateByteArray(Map* map, HeapObject** slot,
                                        HeapObject* object) {
     int object_size = reinterpret_cast<ByteArray*>(object)->ByteArraySize();