[issue37348] add _PyUnicode_FROM_ASCII macro

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Most of changes are in not performance sensitive code. I do not think there is a benefit of using new macro there.

If PyUnicode_FromString() is slow I prefer to optimize it instead of adding yet one esoteric private function for internal needs.

In case of dict.__repr__() we can get even more gain by using _Py_IDENTIFIER or more general API proposed by Victor.

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nosy: +serhiy.storchaka

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