[clang] [clang-tools-extra] [clang] Extend diagnose_if to accept more detailed warning information (PR #70976)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Sorry for the delay in review!

This seems like the right direction to go, in general. As @erichkeane, it's a bit hard to review due to the whitespace-only changes and changes to `__is_trivially_equality_comparable`, you should remove those changes or split them into a separate PR.



https://github.com/llvm/llvm-project/pull/70976