nir/lower_int64: replace uadd_sat with ior for find_lsb64 and ufind_msb64
Using ior here is equivalent to using uadd_sat, but works for every driver and shouldn't hurt anywhere. I forgot to fix this up when fixing up some vvl errors with zink. Fixes crashes with the integer_ctz CL CTS tests in zink. Fixes: 39ec184d ("zink: lower 64 bit find_lsb, ufind_msb and bit_count") Reviewed-by:Karol Herbst <kherbst@redhat.com> Reviewed-by:
Alyssa Rosenzweig <alyssa@rosenzweig.io> Part-of: <mesa/mesa!30535> (cherry picked from commit 48acf9d3)