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

[STINNER Victor]

STINNER Victor added the comment:

msg223186, Serhiy Storchaka about inline.patch: "Confirmed speed up about 20%. Surprisingly it affects even integers outside of the of preallocated small integers (-5...255)."

The optimization applies to Python int with 0 or 1 digit so in range [-2^30+1; 2^30-1].

Small integers in [-5; 255] might be faster but for PyLong_FromLong().

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