[Bug debug/78247] Unused inline function returning u32string causes u32string debuginfo to be emitted.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78247

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I don't think this is anything we can fix for dwarf2; maybe for dwarf4 (or 5)
with split debugging.