[issue38252] micro-optimize ucs1lib_find_max_char in Windows 64-bit build

[Ma Lin]

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

Maybe @sir-sigurd can find more optimizations.

FYI, `_Py_bytes_isascii()` function [1] also has similar code.
[1] https://github.com/python/cpython/blob/v3.8.0b4/Objects/bytes_methods.c#L104

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<https://bugs.python.org/issue38252>
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