[clang] [LifetimeSafety] Suggest lifetime annotations (PR #169767)

[Gábor Horváth via cfe-commits]

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

This looks great, thanks!

There is one significant feature that would be nice to support, detecting missing lifetimebound annotations for the implicit object parameter! I think that is probably better be addressed in a follow-up though and that might be a bit more involved. 

https://github.com/llvm/llvm-project/pull/169767