bfa7ec0aa0
Scalarizing preambles in NIR isn't really necessary, we can do it more efficiently in the backend. This makes the final NIR a lot less annoying to read; the backend IR was already nice to read thanks to all the scalarized moves being copypropped. Plus, this is a lot simpler. No shader-db changes. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21122>