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

[Stefan Gränitz via llvm-commits]

weliveindetail wrote:

Ping @mysterymath. This is blocking the two linked PRs right now. Is there anything I can do to help with review? Basically, this patch is the necessary plumbing for your request in https://github.com/llvm/llvm-project/pull/188969#discussion_r3054133734

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