[issue27145] long_add and long_sub might return a new int where &small_ints[x] could be returned

[hongweipeng]

Change by hongweipeng <hongweichen8888 at sina.com>:


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pull_requests: +15370
pull_request: https://github.com/python/cpython/pull/15716

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue27145>
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