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freedreno/a6xx: CPU and CP overhead optimizations

Rob Clark requested to merge robclark/mesa:wip/overhead into master

A combination of tweaks to reduce CP overhead (esp. important for high draw count when not in bypass mode, ie. where CP can potentially need to execute the state change per-bin), and CPU overhead. Mostly from spending some time looking at gfxbench gl_driver2, which does a ton of tiny draws with frequent state changes.

the overall improvements are:

  • GMEM case (CP limited) - 10%
  • bypass case (CPU limited) - 50%

ofc we still need to figure out how to do something like #2798 (closed) to realize that despite the high number of draw calls, we would be better off using sysmem.

Edited by Rob Clark

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