[issue21487] Assorted ipaddress performance improvements

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Alternative implementations of _count_righthand_zero_bits():

def _count_righthand_zero_bits(number, bits):
    if not number:
        return bits
    return (~number & (number-1)).bit_length()

or

def _count_righthand_zero_bits(number, bits):
    if not number:
        return bits
    return (~(number | -number)).bit_length()

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue21487>
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