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2012-09-14Don't compute ((uint64_t)1)<<64 in round_to_power_of_2Nick Mathewson
This would be undefined behavior if it happened. (It can't actually happen as we're using round_to_power_of_2, since we would have to be trying to allocate exabytes of data.) While we're at it, fix the behavior of round_to_power_of_2(0), and document the function better. Fix for bug 6831.