[clang] [LifetimeSafety] Add origin tracking for lambda captures (PR #185216)

[Gábor Horváth via cfe-commits]

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

Overall looks good to me. 

That being said, merging all the lifetimes here is a new source of imprecision. I wonder if lambda related warnings should be under a separate warning flag?

https://github.com/llvm/llvm-project/pull/185216