pan/bi: Fix constant slot selection

The fau_index field contains the lower 4 bits of the 64bit constant,
which allows one to reuse the same clause constant slot from different
bundles if the upper 60 bits match. That doesn't work for constants
referenced from the same instruction or for constants referenced from
two instructions that are part of the same bundle though, since the
fau_index is shared in that case.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <!8418>
42 jobs for !8418 with bifrost-ubo-fixes in 11 minutes and 8 seconds (queued for 2 seconds)
merge request