ASAN heap-use-after-free in Item_exists_subselect::is_top_level_item

check that we can do type casting

sql/item_cmpfunc.cc

@@ -1234,7 +1234,9 @@ longlong Item_func_truth::val_int()
 
 bool Item_in_optimizer::is_top_level_item()
 {
+  if (!invisible_mode())
     return ((Item_in_subselect *)args[1])->is_top_level_item();
+  return false;
 }