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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thank you Zach. I found even small regression.

Before:

$ ./python -m timeit -s "x = 10"  "x+x; x+x; x+x; x+x; x+x; x+x; x+x; x+x; x+x; x+x"
1000000 loops, best of 3: 1.51 usec per loop

After:

$ ./python -m timeit -s "x = 10"  "x+x; x+x; x+x; x+x; x+x; x+x; x+x; x+x; x+x; x+x"
1000000 loops, best of 3: 1.6 usec per loop

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21955>
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