pan/bi: Print program size in shader-db

pan/bi: Print program size in shader-db

Less critical than other metrics, but still matters for instruction
cache hit rate, and worth being aware of.

And, fine, it makes the scheduler look like a bigger win on another
axis.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8354>