radeonsi: always use ACO callbacks to scalarize/vectorize 16-bit ALU

This fixes 16-bit ALU with LLVM.

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34016>
1 file changed