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

[Yury Selivanov]

Yury Selivanov added the comment:

Antoine, FWIW I agree on most of your points :)  And yes, numpy, scipy, numba, etc rock.

Please take a look at my fastint4.patch.  All tests pass, no performance regressions, no crazy inlining of floating point exceptions etc.  And yet we have a nice improvement for both ints and floats.

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