[pdb] Parse and dump section map and section contribs

Differential Revision: http://reviews.llvm.org/D20876
Reviewed By: rnk, ruiu

llvm-svn: 271488
diff --git a/llvm/lib/DebugInfo/PDB/Raw/ModStream.cpp b/llvm/lib/DebugInfo/PDB/Raw/ModStream.cpp
index 8b7a715..b7204cb 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/ModStream.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/ModStream.cpp
@@ -45,6 +45,10 @@
     return EC;
   if (auto EC = Reader.readStreamRef(C13LinesSubstream, C13Size))
     return EC;
+  ArrayRef<uint8_t> LineBytes;
+  codeview::StreamReader LinesReader(C13LinesSubstream);
+  if (auto EC = LinesReader.readBytes(LineBytes, C13LinesSubstream.getLength()))
+    return EC;
 
   uint32_t GlobalRefsSize;
   if (auto EC = Reader.readInteger(GlobalRefsSize))