[issue25318] Add _PyBytesWriter API to optimize Unicode encoders

[Roundup Robot]

Roundup Robot added the comment:

New changeset c134eddcb347 by Victor Stinner in branch 'default':
Issue #25318: Move _PyBytesWriter to bytesobject.c
https://hg.python.org/cpython/rev/c134eddcb347

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<http://bugs.python.org/issue25318>
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