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For GFX11 export dual source blend outputs when ACO. ACO need a pseudo instruction to emit a block of code which can't be done in nir currently. Reviewed-by: Rhys Perry <pendingchaos02@gmail.com> Signed-off-by: Qiang Yu <yuq825@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22199>