[llvm] [llvm-debuginfod] Update tests to work with internal shell (PR #158141)

[Paul Kirth via llvm-commits]

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

LGTM. I can watch our bots for you, since @mysterymath is OOO for a week. But this seems totally reasonable.

https://github.com/llvm/llvm-project/pull/158141