nv50/ir/nir: fix global_atomic_comp_swap
Fixes: 20d0ae46 ("nv50/ir: implement global atomics and handle it for nir") Signed-off-by:Karol Herbst <kherbst@redhat.com> Reviewed-by:
Pierre Moreau <dev@pmoreau.org> Part-of: <!6367> (cherry picked from commit b283fb33)