[clang] [CIR] Upstream CIR Dialect TryOp with Catch Attrs (PR #162897)

[Andy Kaylor via cfe-commits]

https://github.com/andykaylor approved this pull request.

This looks much better now. Thanks!

I have some nits about the naming of things involving "catch" where it might also be an unwind handler (or almost certainly some kind of cleanup in the near future), but I don't feel strongly about that if no one else objects to the current names.

https://github.com/llvm/llvm-project/pull/162897