[issue25301] Optimize UTF-8 decoder with error handlers

[STINNER Victor]

STINNER Victor added the comment:

Here is a first patch. It is written to keep best performances for valid UTF-8 encoded string, but speedup strings with a few undecodable bytes.

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keywords: +patch
Added file: http://bugs.python.org/file40663/utf8_decoder.patch

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<http://bugs.python.org/issue25301>
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