Issue #28701: Replace _PyUnicode_CompareWithId with _PyUnicode_EqualToASCIIId.

The latter function is more readable, faster and doesn't raise exceptions.

Based on patch by Xiang Zhang.

diff --cc Include/unicodeobject.h
Simple merge

diff --cc Objects/typeobject.c
Simple merge

diff --cc Objects/unicodeobject.c
Simple merge

diff --cc Python/errors.c
Simple merge

diff --cc Python/pythonrun.c
Simple merge