[SimplifyCFG] Avoid truncation in linear map overflow check This is supposed to test multiplication of the linear multiplifier with the largest value it can be multiplied with. However, if we truncate TableSize-1 here, it might not actually be the largest value. I think in practice this still works out, because in cases where we'd truncate the value here we'd also fail the NonMonotonic check. But to match the intent of the code, we should treat the truncating case as overflowing.
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