[issue37752] Redundant Py_CHARMASK called in some files

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

VC2017 optimizes multiple `unsigned char)((c) & 0xff` to a single `movzx` operation, maybe other compilers do it as well.
If so, there will be no performance changes.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37752>
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