[Bug d/110193] d_signed_or_unsigned_type is invoked for vector types

[ibuclaw at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110193

--- Comment #4 from ibuclaw at gcc dot gnu.org ---
A shortcut to signed_or_unsigned_type_for for vector types seems reasonable
nonetheless.