nv50/ir: Convert to new-style NIR registers
Shader-db results on Turing:
total inst in shared programs :
11121531 ->
11121458 (-0.00%)
total gpr in shared programs : 1848287 -> 1848425 (0.01%)
total ugpr in shared programs : 0 -> 0 (0.00%)
total local in shared programs : 27200 -> 27200 (0.00%)
total shared in shared programs : 236476 -> 236476 (0.00%)
total bytes in shared programs :
177944496 ->
177943328 (-0.00%)
total cached in shared programs : 0 -> 0 (0.00%)
inst gpr ugpr local shared bytes cached
helped 470 50 0 0 0 470 0
hurt 327 197 0 0 0 327 0
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24110>