[issue13134] speed up finding of one-character strings

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset af4a89f4f466 by Antoine Pitrou in branch 'default':
Issue #13134: optimize finding single-character strings using memchr
http://hg.python.org/cpython/rev/af4a89f4f466

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nosy: +python-dev

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