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

[Charles-François Natali]

Charles-François Natali added the comment:

> __libc_calloc() starts with a check on integer overflow.

Yes, see my previous message:
"""
AFAICT, the two arguments are purely historical (it was used when
malloc() didn't guarantee suitable alignment, and has the advantage of
performing overflow check when doing the multiplication, but in our
code we always check for it anyway).
"""

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