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We can just specify this as a source to the logical FB read/write opcodes. Notably FB reads had no sources before; now they have one. Reviewed-by: Caio Oliveira <caio.oliveira@intel.com> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33297>