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amd/common: Optimize the computation of retile maps.

Bas Nieuwenhuizen requested to merge bnieuwenhuizen/mesa:retile-map-tile-opt into master

Was playing around with how we store retile maps, and I wanted to remove the optimization to not calculate the map for imported textures (for another MR), and was looking at how not to regress performance. I think this MR is a good improvement even if I end up removing that optimization:

Behavior around ~1080p on a 2500U:

old:
  30-60 ms on every miss

new:
  5 ms initally (miss in the tile cache)
  <0.5 ms afterwards

Also included a small addrlib cleanup.

Edited by Bas Nieuwenhuizen

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