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panfrost: Implement glProvokingVertex() on Valhall

Merged Alyssa Rosenzweig requested to merge alyssa/mesa:panfrost/valhall-provoking-vertex into main 
Starting with Valhall, the provoking vertex state is specified per-framebuffer
(batch) instead of per-draw. We use the pan_tristate infrastructure to translate
between desktop OpenGL's per-draw semantics to Valhall's per-framebuffer
semantic. This is notably not required for GLES or Vulkan.

Fixes arb-provoking-vertex-render on Valhall.

Note to reviewers: I split out the assert in the last patch from the active patch here. This is just to avoid the is_defined helper needing a backport.

Edited by Alyssa Rosenzweig