[issue16311] Use _PyUnicodeWriter API in text decoders

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


Added file: http://bugs.python.org/file27808/decodebench.res

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16311>
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