[llvm] [LLVM] Update exception handling maintainer (PR #120585)

[Reid Kleckner via llvm-commits]

rnk wrote:

I have a pretty decent understanding of how both systems (WinEH and DWARF) work and I would volunteer to write my name down for exception handling. I can't speak to the other platform specific unwind info formats (MachO compact unwind and ARM), but that's less relevant here.

https://github.com/llvm/llvm-project/pull/120585