[llvm] [BasicAA] Improve escape source analysis for return-only captures (PR #131869)

[Nikita Popov via llvm-commits]

nikic wrote:

There are some improvements on llvm-opt-benchmark, but not a lot. Would be nice to fix this somehow, but it's not particularly important and not worth increasing compile-time for.

https://github.com/llvm/llvm-project/pull/131869