[llvm-branch-commits] Revert "Reapply "[clang] Extend diagnose_if to accept more detailed warning information (#70976)" (#108453)" (PR #108645)

[Florian Mayer via llvm-branch-commits]

fmayer wrote:

I submitted this to get the buildbot back to green, happy to help if you have more questions on how to reproduce!

https://github.com/llvm/llvm-project/pull/108645