[issue47128] Enhance Argument Clinic's NoneType return converter to give `void`

[Oleg Iarygin]

Oleg Iarygin <oleg at arhadthedev.net> added the comment:

Actually, you're right. For now, PyErr_Occurred is a GIL lock plus a memory access. While the access is cheap because of a L1 cache hit, the GIL takes its toll in a hot path.

So I'm closing the PR until GIL removal is done so no performance penalty will be imposed.

I could use _PyErr_Occurred because "Currently Argument Clinic is considered internal-only for CPython", but it requires extra modifications of the clinic that is undesirable.

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<https://bugs.python.org/issue47128>
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