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

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

> For globs, there's a very simple rule that's spelled out in GlobPattern.h:
> 
> > `\` escapes the next character so it is treated as a literal.
> 
> If we canonicalize everything to forward slashes, then we'd be violating that rule, since `foo\\bar` would match `foo/bar`, even though the escaped `\` should have been treated as a literal.

how to match "foo\[bar]" ?

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