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`lower_pv_mode_vertices_for_prim` and `decomposed_primitive_size` return the same values as `mesa_vertices_per_prim` for the primitives that can be used as output in geometry shaders. Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26117>