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

[Yury Selivanov]

Yury Selivanov added the comment:

Attaching another approach -- fastint5.patch.

Similar to what fastint4.patch does, but doesn't export any new APIs.  Instead, similarly to abstract.c, it uses type slots directly.

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Added file: http://bugs.python.org/file41815/fastint5.patch

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