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

[Yury Selivanov]

Yury Selivanov added the comment:

> Yury suggested running perf.py twice with the binaries swapped

Yeah, I had some experience with perf.py when its results were skewed depending on what you test first.  Hopefully Victor's new patch will fix that http://bugs.python.org/issue26275

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