[clang] [CIR] Emit CatchParamOp in the catch region (PR #171169)

[Andy Kaylor via cfe-commits]

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

I think we'll eventually want to have a target-independent way of representing C++ exception handling. What you have here is actually target-independent except for the fact that it's implemented in `CIRGenItaniumCXXABI`. We can clean that up later when we have a more complete implementation.

This looks good for now.

https://github.com/llvm/llvm-project/pull/171169