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v3dv: improve dirty uniform state tracking

Iago Toral requested to merge itoral/mesa:v3dv_dirty_state_tracking into master

This improves a few things:

  • Uses the set layout stages to track more precisely the stages affected by a dirty descriptor
  • Ditto for push constants
  • A dirty viewport does not affect uniform state for fragment shaders.

These changes allow the UE4 Vehicle sample skip up to ~120 uniform stream updates per frame.

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