[issue37348] Optimize PyUnicode_GetString for short ASCII strings

[Inada Naoki]

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


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pull_requests: +14105
pull_request: https://github.com/python/cpython/pull/14283

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37348>
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