[clang] clang: Forward exception_model flag for bitcode inputs (PR #146342)

[Jan Svoboda via cfe-commits]

https://github.com/jansvoboda11 approved this pull request.

This is unfortunate. I think `ExceptionHandling` lives in `LangOptions` mainly because it's used to set predefined macros, similar to `Optimize` and others. This LGTM as an immediate workaround, but can you make sure to leave behind a FIXME?

https://github.com/llvm/llvm-project/pull/146342