Replaced some overflowing muls with wrapping muls #40
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overflowing_muls are slow, and likely will be even after #21 is mixed. This pull request makes the number ofoverflowing_muls in allpowfunctions O(1) withexp. Also,I256::checked_mulnow usesumulcrather thanimulc.I didn't benchmark the
pows, so I was conservative with what I tried to optimize. Ifpowis being called a lot with high exponents, it might be worth taking a closer look.