[llvm] [dsymutil] Filter our swiftinterface files from the toolchain. (PR #71205)

[Adrian Prantl via llvm-commits]

adrian-prantl wrote:

I made an attempt to fix this here:

commit 2d460f25f14db38e566810040806c95f9edd78b5 (HEAD -> main)
Author: Adrian Prantl <aprantl at apple.com>
Date:   Fri Nov 3 18:26:22 2023 -0700

    Attempt to fix test on Windows.
    
    I'm assuming that because sys::path::append defaults to native path
    this fails. Since dsymutil is a Darwin tool, we can just hardcode the
    UNIX path separator.

https://github.com/llvm/llvm-project/pull/71205