FactorOutConstant - Test if S is divisible by Factor, using signed division. If so, update S with Factor divided out and return true. S need not be evenly divisible if a reasonable remainder can be computed. TODO: When ScalarEvolution gets a SCEVSDivExpr, this can be made unnecessary; in its place, just signed-divide Ops[i] by the scale and check to see if the divide was folded.
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