[clang] [C++20] [Modules] Support generating in-class defined function with try-catch body (PR #129212)

[Matheus Izvekov via cfe-commits]

https://github.com/mizvekov commented:

We could use a scope guard here to avoid the duplication, and this includes the pre-existing EOF handling. This would make this sort of bug more unlikely to happen in the future.

https://github.com/llvm/llvm-project/pull/129212