[clang] [APINotes] Refactor APINotesReader to propagate llvm::Error (PR #183812)

[Maria Fernanda Guimarães via cfe-commits]

mafeguimaraes wrote:

> This is good to go now. Do you have commit access or do you need someone to hit the merge for you?

I don't have commit access, so I would really appreciate it if you could hit merge for me!

Thanks again for your time and all the help with the reviews.

https://github.com/llvm/llvm-project/pull/183812