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iris: Enable HiZ for non-8x4 aligned miplevels on Icelake and later

Kenneth Graunke requested to merge kwg/mesa:iris-hiz-3 into main

8x4 alignment was absolutely required prior to Gfx8, and while some things were relaxed on Gfx8-9, Nanley's experiments in issue #3788 (closed) indicated that there were still issues on those platforms.

It appears that the restrictions were relaxed on Icelake and non-8x4 aligned HiZ "should" work on Gfx11+.

2022: Now rebased and rewritten for intervening changes, retargeted at Gfx11+ only.

Car Chase results on my Tigerlake NUC are 0.0945704% +/- 0.0726234% (n=20). INTEL_MEASURE=1 shows that there are no more hiz ambiguates. However, the slow clear mentioned in #5258 (closed) still persists due to another restriction not fixed in this series.

Edited by Kenneth Graunke

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