pan/bi: Add BI_TABLE for fast table accesses

Used to implement SPECIAL ops. Separate class since they are faster
which means you can pair them with actual work on FMA.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4615>
5 files changed