[issue21233] Add *Calloc functions to CPython memory allocation API

[STINNER Victor]

STINNER Victor added the comment:

> So what is the point of _PyObject_GC_Calloc ?

It calls calloc(size) instead of malloc(size), calloc() which can be faster than malloc()+memset(), see:
https://mail.python.org/pipermail/python-dev/2014-April/133985.html

_PyObject_GC_Calloc() is used by PyType_GenericAlloc(). If I understand directly, it is the default allocator to allocate Python objects.

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