[SCEV] Factor out utility for proving same sign of two SCEVs [nfc] (#170376) This is a slightly different API than ConstantRange's areInsensitiveToSignednessOfICmpPredicate. The only actual difference (beyond naming) is the handling of empty ranges (i.e. unreachable code). I wanted to keep the existing SCEV behavior for the unreachable code as we should be folding that to poison, not reasoning about samesign. I tried the other variant locally, and saw no test changes.
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