[issue22030] Use calloc in set resizing

[STINNER Victor]

STINNER Victor added the comment:

Be careful. In my tests, calloc() was slower than malloc() + memset() for
memory blocks smaller than 1 MB. Calloc() can be interesting if only a few
pages (4096 bytes) are modified.

You must provide benchmarks.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22030>
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