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

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Common platform:
> Timer: time.perf_counter
> Timer info: namespace(adjustable=False, implementation='clock_gettime(CLOCK_MONOTONIC)', monotonic=True, resolution=1e-09)
> Platform: Linux-3.13.9-200.fc20.x86_64-x86_64-with-fedora-20-Heisenbug
                                                               ^^^^^^^^^
Are you sure this is a good platform for performance reports? :)

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