[issue7940] re.finditer and re.findall should support negative end positions

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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pull_requests: +14540
pull_request: https://github.com/python/cpython/pull/14744

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue7940>
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