When grabbing SourceLocs from different Preprocessors, they cannot be
compared with each other by using their comparison operator.
I assume this is because they have some kind of pointer identity and
equality just compares raw representations.
I attached a function that helped me solve this issue. Can you please
give feedback if I missed something existing or if there is an issue
with my approach? Or maybe the SourceManager/Preprocessor should not
even create new "duplicate" SrcLocs in this case?