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

[Stefan Krah]

Stefan Krah added the comment:

With the latest patch the decimal benchmark with a lot of small
allocations is consistently 2% slower. Large factorials (where
the operands are initialized to zero for the number-theoretic
transform) have the same performance with and without the patch.

It would be interesting to see some NumPy benchmarks (Nathaniel?).

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