zink: Sauerbraten perf is 50% worse on ANV
As reported in #8223, this game's perf is mysteriously very bad on zink+anv compared to iris (running at ~50-60% the fps).
I've captured a single frame trace that demonstrates the issue: https://gitlab.freedesktop.org/zmike/dumps/-/blob/master/linux_64_client-trim-trim.trace
Thus far, the most info anyone's found for it is @anholt discovering that INTEL_DEBUG=noccs
may yield a slight perf boost on some hw (though not on ICL from what I can see).