[llvm] [llvm][Support] Add UNIX socket support (PR #73603)

[Juergen Ributzka via llvm-commits]

================
@@ -16,6 +16,7 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/DataTypes.h"
+#include "llvm/Support/Threading.h"
----------------
ributzka wrote:

Is this include required in the header?

https://github.com/llvm/llvm-project/pull/73603