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

[STINNER Victor]

STINNER Victor added the comment:

> python -m timeit  "sum([x * x * 1 for x in range(100)])"

If you only want to benchmark x*y, x+y and list-comprehension, you
should use a tuple for the iterator.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21955>
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