[issue21449] Replace _PyUnicode_CompareWithId with _PyUnicode_CompareWithIdEqual

[Xiang Zhang]

Xiang Zhang added the comment:

> _PyUnicode_CompareWithId is a private function. We can remove it if it has issues.

It doesn't. But once there is _PyUnicode_EqualToASCIIId, it's can be rarely used.

The new patch implements a version of _PyUnicode_EqualToASCIIId.

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Added file: http://bugs.python.org/file45499/_PyUnicode_EqualToASCIIId.patch

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