Don't do unnecessary crank "simulations" #117
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Since we lazily crank individual lenders, we don't need to call back into
currentWithdrawState(which "simulates" cranking the lender, though in this case, doesn't do much since they're already up-to-date) in subsequent code. This updates the withdrawmanager to pass through the withdraw state after cranking so it doesn't need to be re-read from disk / re-simulated-cranked.Modest gas improvement, from 290k to 260k on a
redeem.