nir/lower_tex: Add a lower_txd_clamp option

Some of us want to lower all TXD with min_lod regardless of whether or
not it's shadow or cube or whatever.

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25000>
2 files changed