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as a simple post-RA peephole. much much easier to do post-RA than pre-RA. This isn't a post-RA /pass/ in the traditional sense... it's done while assigning registers to coalesce the passes over the IR, since we pay per-pass and we can merge the walks over the IR. Closes: #4480 Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>