[llvm] [llvm-exegesis]Allow clients to do their own snippet running error ha… (PR #74711)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM. Thanks for putting this together! This is definitely significantly better than the hacky approach I proposed.

https://github.com/llvm/llvm-project/pull/74711