[issue23573] Avoid redundant allocations in str.find and like

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6db9d7c1be29 by Serhiy Storchaka in branch 'default':
Issue #23573: Increased performance of string search operations (str.find,
https://hg.python.org/cpython/rev/6db9d7c1be29

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23573>
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