[llvm] [llvm][Support][Windows] Fix slash in path for remove_directories (PR #121448)

[Jinsong Ji via llvm-commits]

================
@@ -1326,6 +1326,9 @@ TEST_F(FileSystemTest, Remove) {
 
   ASSERT_NO_ERROR(fs::remove_directories("D:/footest"));
 
+  ASSERT_NO_ERROR(fs::remove_directories(Twine(BaseDir) + "/foo/bar/baz"));
----------------
jsji wrote:

yes, it was failing without the fix .

https://github.com/llvm/llvm-project/pull/121448