[issue31690] Make RE "a", "L" and "u" inline flags local

[INADA Naoki]

Change by INADA Naoki <songofacandy at gmail.com>:


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keywords: +patch
pull_requests: +3858
stage: needs patch -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31690>
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