pan/bi: Add liveness analysis pass

Now that all the guts are shared with Midgard, it's just a matter of
wiring it in.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4150>
3 files changed