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panvk: implement multiview on v10+

Benjamin Lee requested to merge benjaminl/mesa:panvk-multiview into main

Multiview is implemented by looping over enabled views in the vertex shader and writing multiple copies of outputs.

CTS results for dEQP-VK.multiview.* on a G610:

Test run totals:
  Passed:        314/649 (48.4%)
  Failed:        3/649 (0.5%)
  Not supported: 332/649 (51.2%)
  Warnings:      0/649 (0.0%)
  Waived:        0/649 (0.0%)

I also tested the pointsize case by modifying the CTS multiview tests to add a dummy pointsize write in the vertex shader.

The three failures are depth/stencil tests. These are a CTS bug, with a patch here (public link here).

/cc @marysaka @bbrezillon

Edited by Benjamin Lee

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