nir: Add simplistic lowering for bany_equal/ball_inequal.

It would be nice if we could do swizzling of an expression on the
replacement side so that we could have a single ieq/ine of the vector
after CSE.  However, if you do want vector operations, nir_opt_vectorize()
does just fine.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6567>
2 files changed