[issue31031] Unify duplicate bits_in_digit and bit_length

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Thanks Niklas Fiekas for merging duplicated code ;-) It should make factorial_partial_product() a little bit more efficient!

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31031>
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