micro optimization

[sunmisc]

use a faster calculation of the power of two closest to input - 1, which uses bitwise operations at the hardware level (Intrinsic)

[wolfieboy09]

What about return (-1 >>> Integer.numberOfLeadingZeros(input - 1)) + 1;? Makes the function into one line

[sunmisc]

What about return (-1 >>> Integer.numberOfLeadingZeros(input - 1)) + 1;? Makes the function into one line

Yeah, thanks, that's better.