Reland "[heap] Fine-grained JSArrayBuffer tracking"

src/heap/objects-visiting-inl.h

Index: src/heap/objects-visiting-inl.h
diff --git a/src/heap/objects-visiting-inl.h b/src/heap/objects-visiting-inl.h
index c504988436f79f562eb73530db3ff4b30da489da..db2d1141b41cef0bf0a3a44a3c002715d8bb8c97 100644
--- a/src/heap/objects-visiting-inl.h
+++ b/src/heap/objects-visiting-inl.h
@@ -105,11 +105,6 @@ int StaticNewSpaceVisitor<StaticVisitor>::VisitJSArrayBuffer(
     Map* map, HeapObject* object) {
   typedef FlexibleBodyVisitor<StaticVisitor, JSArrayBuffer::BodyDescriptor, int>
       JSArrayBufferBodyVisitor;
-
-  if (!JSArrayBuffer::cast(object)->is_external()) {
-    Heap* heap = map->GetHeap();
-    heap->array_buffer_tracker()->MarkLive(JSArrayBuffer::cast(object));
-  }
   return JSArrayBufferBodyVisitor::Visit(map, object);
 }
 
@@ -524,17 +519,9 @@ void StaticMarkingVisitor<StaticVisitor>::VisitJSRegExp(Map* map,
 template <typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitJSArrayBuffer(
     Map* map, HeapObject* object) {
-  Heap* heap = map->GetHeap();
-
   typedef FlexibleBodyVisitor<StaticVisitor, JSArrayBuffer::BodyDescriptor,
                               void> JSArrayBufferBodyVisitor;
-
   JSArrayBufferBodyVisitor::Visit(map, object);
-
-  if (!JSArrayBuffer::cast(object)->is_external() &&
-      !heap->InNewSpace(object)) {
-    heap->array_buffer_tracker()->MarkLive(JSArrayBuffer::cast(object));
-  }
 }