Forward the sample-rate shading info to spirv_to_dxil() so we can claim to support sampleRateShading. Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com> Reviewed-by: Jesse Natalie <jenatali@microsoft.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15916>