pan/mdg: Handle nir_texop_txf_ms

Same as nir_texop_txf, the special case where sample = 0.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5782>
1 file changed