[objects] do not visit ArrayBuffer's backing store

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 8873f637929853044ec4e531a5a428e6cfb387eb..8bf46c61264c788a5eb26781c84f5147d8247117 100644
--- a/src/heap/objects-visiting-inl.h
+++ b/src/heap/objects-visiting-inl.h
@@ -92,10 +92,8 @@ int StaticNewSpaceVisitor<StaticVisitor>::VisitJSArrayBuffer(
     Map* map, HeapObject* object) {
   Heap* heap = map->GetHeap();
 
-  VisitPointers(
-      heap, object,
-      HeapObject::RawField(object, JSArrayBuffer::BodyDescriptor::kStartOffset),
-      HeapObject::RawField(object, JSArrayBuffer::kSizeWithInternalFields));
+  JSArrayBuffer::BodyDescriptor::IterateBody<
+      StaticNewSpaceVisitor<StaticVisitor> >(heap, object);
   if (!JSArrayBuffer::cast(object)->is_external()) {
     heap->array_buffer_tracker()->MarkLive(JSArrayBuffer::cast(object));
   }
@@ -528,10 +526,7 @@ void StaticMarkingVisitor<StaticVisitor>::VisitJSArrayBuffer(
     Map* map, HeapObject* object) {
   Heap* heap = map->GetHeap();
 
-  StaticVisitor::VisitPointers(
-      heap, object,
-      HeapObject::RawField(object, JSArrayBuffer::BodyDescriptor::kStartOffset),
-      HeapObject::RawField(object, JSArrayBuffer::kSizeWithInternalFields));
+  JSArrayBuffer::BodyDescriptor::IterateBody<StaticVisitor>(heap, object);
   if (!JSArrayBuffer::cast(object)->is_external() &&
       !heap->InNewSpace(object)) {
     heap->array_buffer_tracker()->MarkLive(JSArrayBuffer::cast(object));