[issue46407] optimizing `1 << n` or `2 ** n` and modulo-only operations

[Serhiy Storchaka]

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


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nosy: +mark.dickinson, rhettinger, stutzbach, tim.peters

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46407>
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