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turnip: Treating non-d/s-write pipelines as not having d/s feedback loops.

Emma Anholt requested to merge anholt/mesa:tu-autotune-dsloop into main 
A subpass in gfxbench has the depth buffer present, but not written to,
for a render pass using the depth buffer as an input attachment.  We can
skip single-prim-mode and the associated "oh no don't use sysmem" in that
case.

Improves gfxbench vk-5-normal perf by 1.56193% +/- 0.0743035% (n=14).
Part of #6327.
Edited by Emma Anholt

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