[clang] [LifetimeSafety] Prevent false-negative lifetimebound verification when origin escapes in an unrelated manner (PR #200786)

[Gábor Horváth via cfe-commits]

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

LG! I have one nit inline for you consideration. 

https://github.com/llvm/llvm-project/pull/200786