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

[Yury Selivanov]

Yury Selivanov added the comment:

> Ok. Now I'm lost. We have so many patches :-) Which one do you prefer?

To no-ones surprise I prefer fastint5, because it optimizes almost all binary operators on both ints and floats.

inline-2.patch only optimizes just + and - for just ints.  If + and - performance of inline-2 is really important, I suggest to merge it in fastint5, but i'd keep it simple ;)

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