[issue37907] speed-up PyLong_As*() for large longs

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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nosy: +serhiy.storchaka, vstinner

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37907>
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