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

[Charles-François Natali]

Charles-François Natali 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

It will only make a difference if the allocated region is large enough
to be allocated by mmap (so not for 90% of objects).

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<http://bugs.python.org/issue21233>
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