Correctly check if a path is a directory. Fix by Brian Korver.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115991 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Unix/Path.inc b/lib/System/Unix/Path.inc
index 184da1e..4c97c4b 100644
--- a/lib/System/Unix/Path.inc
+++ b/lib/System/Unix/Path.inc
@@ -439,7 +439,7 @@
   struct stat buf;
   if (0 != stat(path.c_str(), &buf))
     return false;
-  return buf.st_mode & S_IFDIR ? true : false;
+  return ((buf.st_mode & S_IFMT) == S_IFDIR) ? true : false;
 }
 
 bool