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

[via cfe-commits]

iitianpushkar wrote:

> Before I do a more thorough though, can you resolve the conflicts? We recently merged a PR that added cross-block `buildOriginFlowChain` implementation which would change up the code here quite a bit.

Thanks for the review!
I will first rebase on latest main and then update the patch accordingly.

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