[issue37348] Optimize PyUnicode_GetString for short ASCII strings

[Inada Naoki]

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

PR 14291 seems simpler than PR 14283.  But PR 14283 is faster because _PyUnicodeWriter is a learge struct.

master: 3.7sec
PR 14283: 2.9sec
PR 14291: 3.45sec

compiler: gcc (Ubuntu 8.3.0-6ubuntu1) 8.3.0
without LTO, without PGO

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