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radv: Only use 32 KiB per threadgroup on Stoney.

Bas Nieuwenhuizen requested to merge bnieuwenhuizen/mesa:stoney-tess-fix into master

Causes hangs on some machines.

What works for dEQP-VK.tessellation.shader_input_output.barrier:

  • running num_patches = 6 (which limits LDS to 32 KiB)
  • running num_patches = 8, and artificially cutting LDS size at 32 KiB.

CC: mesa-stable@lists.freedesktop.org

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