[issue21955] ceval.c: implement fast path for integers with a single digit

[Roundup Robot]

Roundup Robot added the comment:

New changeset 61fcb12a9873 by Victor Stinner in branch 'default':
Issue #21955: Please don't try to optimize int+int
https://hg.python.org/cpython/rev/61fcb12a9873

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nosy: +python-dev

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