anv: Better clipping

Merged Faith Ekstrand requested to merge gfxstrand/mesa:review/anv-better-clipping into master

This little MR makes two changes to the clipping in our Vulkan driver:

  1. It enables guardband clipping. I have no idea why it took us so long to do this. It's probably been costing us performance all over the place to not use the guardband.
  2. Do "pop-free" clipping for points. It's just all-around nicer for applications.

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