return the smallest power of two >= x. returns 0 if x == 0 or x > 0x80000000 (ie numbers that would be negative if x was signed) NOTE: the old code took an int, and if you pass in an int of 0x80000000 casted to a uint, you'll get 0x80000000, which is correct for uints, instead of 0, which was correct for ints
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