[Bug target/80845] nvptx backend generates cvt.u32.u32

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80845

--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 41393
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41393&action=edit
tentative patch