[issue21644] Optimize bytearray(int) constructor to use calloc()

[STINNER Victor]

STINNER Victor added the comment:

Stefan also wrote:

"3) Somewhat similarly, I wonder if it was necessary to refactor
   PyBytes_FromStringAndSize(). I find the new version more difficult
   to understand."

This issue can also be addressed here.

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<http://bugs.python.org/issue21644>
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