intel/fs: Use rb_tree to store ACP entries by destination

intel/fs: Use rb_tree to store ACP entries by destination

Using a single data structure seems better. There's no appreciable
performance change. On batman_arkham_city_goty.foz, the difference
reported was 0.48%±0.36% (n=20). Several commits in the MR, including
some that should have no effect at all, reported similar changes. I
attribute this primarily changing of loop alignments and similar.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25091>