fcbc022787
Complement the existing un/pack_32_2x16 opcodes. These are useful for 8-bit format packing. On Midgard, they are equivalent to just a 32-bit move, but other GPUs could lower to other packs if needed. Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Reviewed-by: Eric Anholt <eric@anholt.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5107>