[issue28621] Refactor duplicate code calculating digit's bit length

[Roundup Robot]

Roundup Robot added the comment:

New changeset 1940b72b0a02 by Serhiy Storchaka in branch 'default':
Issue #28621: Sped up converting int to float by reusing faster bits counting
https://hg.python.org/cpython/rev/1940b72b0a02

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nosy: +python-dev

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