[issue46848] Use optimized string search function in mmap.find()

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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nosy: +vstinner
nosy_count: 3.0 -> 4.0
pull_requests: +29762
pull_request: https://github.com/python/cpython/pull/31642

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46848>
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