[clang] Introduce intra-procedural lifetime analysis in Clang (PR #142313)

[Yitzhak Mandelbaum via cfe-commits]

https://github.com/ymand commented:

Overall, looks very good. I would recommend you consider splitting this into multiple smaller PRs, so reviews can focus on a specific aspect. E.g. the FactGenerator and the LifetimeDataflow seems to deserve focused reviews.

https://github.com/llvm/llvm-project/pull/142313