[clang] [LifetimeSafety] Make the dataflow analysis generic (PR #148222)

[Sjoerd Meijer via cfe-commits]

sjoerdmeijer wrote:

Hi @usx95 , thanks for the quick reply, I have narrowed it down to the usage of `-Weverything`.
Is that intended behaviour, does `-Wexperimental-lifetime-safety` gets enabled by that?

https://github.com/llvm/llvm-project/pull/148222