https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69650
--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> ---
"caused" by r44789 which introduced this path (initially with error || to_file
== NULL) with a description of just
(add_line_map): Return pointer to const. When passed NULL to_file
with LC_LEAVE, use the obvious values for the return point so the
caller doesn't have to figure them out.
I will test the change.
