[clang] Line and digit directives, OriginalFileName, ModuleName should be unevaluated strings (PR #201413)

[Abhina Sree via cfe-commits]

abhina-sree wrote:

> Thanks. Can you add a release note? This is potentially a breaking change

I just added a release note in the latest commit, please let me know if I need to make any adjustments, thanks!

https://github.com/llvm/llvm-project/pull/201413