llvm-pdbdump: Re-order header files according to LLVM style guide.

llvm-svn: 229231
diff --git a/llvm/lib/DebugInfo/PDB/PDBSymbolUsingNamespace.cpp b/llvm/lib/DebugInfo/PDB/PDBSymbolUsingNamespace.cpp
index 0b3073c..fea9844 100644
--- a/llvm/lib/DebugInfo/PDB/PDBSymbolUsingNamespace.cpp
+++ b/llvm/lib/DebugInfo/PDB/PDBSymbolUsingNamespace.cpp
@@ -7,8 +7,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/DebugInfo/PDB/PDBSymbol.h"
 #include "llvm/DebugInfo/PDB/PDBSymbolUsingNamespace.h"
+
+#include "llvm/DebugInfo/PDB/PDBSymbol.h"
+
 #include <utility>
 
 using namespace llvm;