radv/aco: Use new GS lowering options for ACO with NGG GS.

This makes it easier for ACO to implement NGG GS:

1. No need to keep track of vertex and primitive counts.
2. No need to discard incomplete primitives.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6964>
1 file changed