https://github.com/AaronBallman commented:

It's not clear to me that we should make these changes, at least as is. This is 
an idiomatic path separator on some platforms, so I worry about `clang-cl` 
diagnosing by default being too chatty on Windows compilations. It seems more 
reasonable for non-Windows targets though.

I think this should get its own diagnostic group so that users can disable it 
explicitly if they need to, there should be a release note in 
`clang/docs/ReleaseNotes.rst` as well so users know about the change.

https://github.com/llvm/llvm-project/pull/186770
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