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To implement GPRPair "properly", we need to be able to shuffle scalars around the register file. That means we need explicit copy/swap instructions that RA can generate them. Add some. Swap is split in a really sketchy way, because of the 1 instruction = 1 dest requirement. Hopefully that requirement is lifted in the future and then this goes away. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>