[clang] [llvm] Make sanitizer special case list slash-agnostic (PR #149886)

[Vitaly Buka via llvm-commits]

https://github.com/vitalybuka requested changes to this pull request.

I believe this patch will not handle pattern:
path "clang\something" agains patter "src:clang/".

Can you please extend the test?

https://github.com/llvm/llvm-project/pull/149886