Put PDB parsing code into a pdb namespace.

llvm-svn: 268072
diff --git a/llvm/lib/DebugInfo/PDB/Raw/StreamReader.cpp b/llvm/lib/DebugInfo/PDB/Raw/StreamReader.cpp
index 707f77f..42fe452 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/StreamReader.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/StreamReader.cpp
@@ -10,6 +10,7 @@
 #include "llvm/DebugInfo/PDB/Raw/StreamReader.h"
 
 using namespace llvm;
+using namespace llvm::pdb;
 
 StreamReader::StreamReader(const StreamInterface &S) : Stream(S), Offset(0) {}