ac,radeonsi: port radeonsi NGG streamout to nir ngg lowering
For radeonsi using nir ngg lowering.
This MR won't take effect until !17109 (merged)
Depends on: !17654 (merged)
For radeonsi using nir ngg lowering.
This MR won't take effect until !17109 (merged)
Depends on: !17654 (merged)