[issue34850] Emit a syntax warning for "is" with a literal

[thautwarm]

thautwarm <yaoxiansamma at gmail.com> added the comment:

What if using identity equality on integer literals is intended?

I'm now trying to speed up the generated code via the integer interning mechanism told by https://docs.python.org/3/c-api/long.html#c.PyLong_FromLong .

I think it okay to not complain when the operand of `is` or `is not` is an integer between -5 and 256.

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nosy: +thautwarm

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