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

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

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

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
I noticed this by instrumenting TYPE_PRECISION and ICEing when applied on
VECTOR_TYPEs.