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anv, iris: implement Wa_14015264727

Jordan Justen requested to merge jljusten/mesa:tpalli-pc-tile-flush into main

These are @tpalli's patches, but he's on vacation. I think @majanes found that this had a significant impact on DG2 unit test results.

I reviewed bspec 46211, and the text that Tapani quoted appeared to apply for gen12+, so I made that change to his patches.

For DG2 these patches were tested for performance impacts, and didn't appear to cause significant regressions for the several workloads tested.

Cc: @kwg, @currojerez

Edited by Tapani Pälli

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