[llvm] [llvm] Errorize DebuginfodFetcher::fetch() for inspection at call-sites (NFC) (PR #191191)

[David Spickett via llvm-commits]

https://github.com/DavidSpickett commented:

I don't have the context to say whether this actually achieves what the others asked for, but in isolation it looks fine.

https://github.com/llvm/llvm-project/pull/191191