[issue37348] Optimize PyUnicode_GetString for short ASCII strings

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

Oh, wait.  Why we used _PyUnicodeWriter here?
Decoding UTF-8 must not require it.  2-pass is enough.

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<https://bugs.python.org/issue37348>
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