[issue22501] Optimise PyLong division by 1 or -1

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Perhaps it would be worth to special case multiplying on 0, 1 and -1 and adding 0, 1 and -1 too.

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stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22501>
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