[issue19219] speed up marshal.loads()

[STINNER Victor]

STINNER Victor added the comment:

"As for output, we could use cached UTF-8 representation of string (always exists for ASCII only strings) before calling PyUnicode_AsUTF8String()."

PyUnicode_AsEncodedString(v, "utf8", "surrogatepass") is expensive. I proposed an optimization for the pickle module, Antoine finished the work: see issue #15596. It's exactly what you suggest: reuse PyUnicode_AsUTF8String().

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<http://bugs.python.org/issue19219>
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