[clang] [LifetimeSafety] Warn on inapplicable `[[clang::lifetimebound]]` when return type can not carry a lifetime (PR #203767)

[Gábor Horváth via cfe-commits]

https://github.com/Xazax-hun approved this pull request.

I think it might be good idea to have these to help adopt certain annotations. 

https://github.com/llvm/llvm-project/pull/203767