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vulkan/wsi: SW path improvements

Faith Ekstrand requested to merge gfxstrand/mesa:vulkan/wsi-wayland-shm into main

The primary improvement here is that the SW paths are both a bit simpler and now work with tiled images by doing the same thing as the PRIME path. In particular, this means the SW paths will work on a real GPU driver as demonstrated by the last two patches. I also implemented VK_EXT_external_memory_host support on the Wayland path which makes it about 3x faster on my TGL laptop.

I don't intend to merge the last patch. It's only for testing. If @llandwerlin wanted to review the second-to-last patch, it seems like an over-all improvement that we should probably have.

Edited by Faith Ekstrand

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