[Bug c++/91477] error messages do not show column numbers for large source files

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91477

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
This is due to limitations in the encoding space for locations which causes us
to drop column numbers at some point.