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

[Stefan Krah]

Stefan Krah added the comment:

I mean, if you run the benchmark 10 times and the unpatched result is always between 11.3 and 12.0 for floats while the patched result is
between 12.3 and 12.9, for me the situation is clear.

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<http://bugs.python.org/issue21955>
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