Revert "[msf] Rename Msf to MSF."

This reverts commit 4d1557ffac41e079bcb1abbcf04f512474dcd6fe.

llvm-svn: 277194
diff --git a/llvm/lib/DebugInfo/PDB/Raw/NameMapBuilder.cpp b/llvm/lib/DebugInfo/PDB/Raw/NameMapBuilder.cpp
index 918a828..3bb4503 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/NameMapBuilder.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/NameMapBuilder.cpp
@@ -9,7 +9,7 @@
 
 #include "llvm/DebugInfo/PDB/Raw/NameMapBuilder.h"
 
-#include "llvm/DebugInfo/MSF/StreamWriter.h"
+#include "llvm/DebugInfo/Msf/StreamWriter.h"
 #include "llvm/DebugInfo/PDB/Raw/NameMap.h"
 #include "llvm/Support/Endian.h"