[msf] Rename Msf to MSF.

In a previous patch, it was suggested to use all caps instead of
rolling caps for initialisms, so this patch changes everything
to do this.

llvm-svn: 277190
diff --git a/llvm/lib/DebugInfo/PDB/Raw/NameMap.cpp b/llvm/lib/DebugInfo/PDB/Raw/NameMap.cpp
index 70b810f..40992e9 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/NameMap.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/NameMap.cpp
@@ -9,8 +9,8 @@
 
 #include "llvm/DebugInfo/PDB/Raw/NameMap.h"
 #include "llvm/ADT/SparseBitVector.h"
-#include "llvm/DebugInfo/Msf/StreamReader.h"
-#include "llvm/DebugInfo/Msf/StreamWriter.h"
+#include "llvm/DebugInfo/MSF/StreamReader.h"
+#include "llvm/DebugInfo/MSF/StreamWriter.h"
 #include "llvm/DebugInfo/PDB/Raw/RawError.h"
 
 using namespace llvm;