Include llvm/Config/config.h in FileSystem.h as it depends upon HAVE_SYS_STAT_H which is defined (or not) in config.h.

llvm-svn: 250923

llvm/include/llvm/Support/FileSystem.h

@@ -30,6 +30,7 @@
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/Twine.h"
+#include "llvm/Config/config.h"
 #include "llvm/Support/DataTypes.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/TimeValue.h"