Avoid converting key to string for deleting of elements

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 5941186dbdf9fed6a48669ae377c38e1ce7f5fcd..6ba7c645b21cd2cc95b56dc62dd5f5c52c41dc58 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -5230,7 +5230,8 @@ MaybeHandle<Object> JSReceiver::DeleteProperty(LookupIterator* it,
 MaybeHandle<Object> JSReceiver::DeleteElement(Handle<JSReceiver> object,
                                               uint32_t index,
                                               LanguageMode language_mode) {
-  LookupIterator it(object->GetIsolate(), object, index);
+  LookupIterator it(object->GetIsolate(), object, index,
+                    LookupIterator::HIDDEN);
   return DeleteProperty(&it, language_mode);
 }