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

[Zach Byrne]

Zach Byrne added the comment:

> Can you figure why unpack_sequence and other benchmarks were slower?
I didn't look really closely, A few of the slower ones were floating point heavy, which would incur the slow path penalty, but I can dig into unpack_sequence.

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