aco/ngg: Implement workgroup reduce / exclusive scan for NGG GS.
This function calculates two things at once: 1. The total number of vertices emitted by the threadgroup. 2. Exclusive scan of emitted vertex count accross the threadgroup. Signed-off-by:Timur Kristóf <timur.kristof@gmail.com> Reviewed-by:
Rhys Perry <pendingchaos02@gmail.com> Part-of: <mesa/mesa!6964>
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