[clang] [clang][dataflow] Add captured parameters to ReferencedDecls for lamb… (PR #117771)

[Yitzhak Mandelbaum via cfe-commits]

https://github.com/ymand requested changes to this pull request.

I think the comments could be a bit stronger, but the code looks fine.

https://github.com/llvm/llvm-project/pull/117771