[clang] [Lifetime Safety] Highlight lifetimebound calls in alias chain diagnostics (PR #206337)

[Gábor Horváth via cfe-commits]

https://github.com/Xazax-hun commented:

My main question is, maybe we do not actually need to store lifetimebound info but can rederive it from expressions on demand? If that is possible, I think that would be an even better direction! Sorry for not pointing this out earlier. 

https://github.com/llvm/llvm-project/pull/206337