8dc861dbb5
Rather than the backend. This way we can handle non-constant offsets as well as constants with a single code path (with the constant offset code subsumed as a special case via NIR's constant folding). This nets us dynamic offset support. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21264>