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YJIT: Implement splat for cfuncs. Split exit cases This also implements a new check for ruby2keywords as the last argument of a splat. This does mean that we generate more code, but in actual benchmarks where we gained speed from this (binarytrees) I don't see any significant slow down. I did have to struggle here with the register allocator to find code that didn't allocate too many registers. It's a bit hard when everything is implicit. But I think I got to the minimal amount of copying and stuff given our current allocation strategy.