[clang] [LifetimeSafety] Introduce buildOriginFlowChain for use-after-scope (PR #199345)

[Gábor Horváth via cfe-commits]

Xazax-hun wrote:

> I had shouldShowInAliasChain for this purpose specifically. We can explicitly mark expressions which make the warnings verbose and less useful.

I see, that makes sense. Do you think it would make sense to include that in this PR or should that be a separate one?
I wonder if it would make sense to do it here so it would reduce the churn in the test cases with the notes (adding and removing).

I think the first list could be fairly small, like assignment, compound assignment, any kinds of calls?

https://github.com/llvm/llvm-project/pull/199345