[issue25349] Use _PyBytesWriter for bytes%args

[Roundup Robot]

Roundup Robot added the comment:

New changeset d9a89c9137d2 by Victor Stinner in branch 'default':
Issue #25349: Optimize bytes % int
https://hg.python.org/cpython/rev/d9a89c9137d2

New changeset 4d46d1588629 by Victor Stinner in branch 'default':
Issue #25349: Add fast path for b'%c' % int
https://hg.python.org/cpython/rev/4d46d1588629

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<http://bugs.python.org/issue25349>
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