[issue37165] Convert _collections._count_elements() to the Argument Clinic

[Raymond Hettinger]

New submission from Raymond Hettinger <raymond.hettinger at gmail.com>:

This lets _count_elements use METH_FASTCALL.

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components: Library (Lib)
messages: 344759
nosy: rhettinger
priority: normal
severity: normal
status: open
type: performance
versions: Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37165>
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