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iris: disable dynamic VAO fastpath on GFX version 9

Marcin Ślusarz requested to merge mslusarz/mesa:issue3277 into master

On my SKL GT2 machine this improves performance in:

  • GLB27 Egypt offscreen by 37%
  • GLB27 TRex offscreen by 22%
  • gfxbench5 Manhattan offscreen by 1.75%
  • gfxbench5 Manhattan31 offscreen by 1.9%
  • gfxbench5 Aztec Ruins high by 2.3%

In Intel performance CI on GFX version 9 it improves performance in:

  • gfxbench5 Manhattan offscreen by 1.65%
  • gfxbench5 Aztec Ruins normal offscreen by 1.33%

Closes: #3277 (closed)

Fixes: 42842306 ("mesa,st/mesa: add a fast path for non-static VAOs")

Huge thanks go to @jekstrand for explaining where the issue actually is.

Edited by Marcin Ślusarz

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