[clang] [Clang][CodeGen] Fix clang codegen eh cleanup (PR #226743)

[Eli Friedman via cfe-commits]

https://github.com/efriedma-quic commented:

Testcase?  Probably should be able to just take an existing test which triggers this codepath, and run it with -fexceptions.

https://github.com/llvm/llvm-project/pull/226743