DWARF: Add basic support for line tables.

The llvm-dwarfdump output isn't very verbose yet.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139771 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/DebugInfo/DWARFContext.h b/lib/DebugInfo/DWARFContext.h
index 3eca952..ead169e 100644
--- a/lib/DebugInfo/DWARFContext.h
+++ b/lib/DebugInfo/DWARFContext.h
@@ -12,6 +12,7 @@
 
 #include "DWARFCompileUnit.h"
 #include "DWARFDebugAranges.h"
+#include "DWARFDebugLine.h"
 #include "llvm/DebugInfo/DIContext.h"
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/ADT/SmallVector.h"
@@ -28,6 +29,7 @@
   SmallVector<DWARFCompileUnit, 1> CUs;
   OwningPtr<DWARFDebugAbbrev> Abbrev;
   OwningPtr<DWARFDebugAranges> Aranges;
+  OwningPtr<DWARFDebugLine> Line;
 
   DWARFContext(DWARFContext &); // = delete
   DWARFContext &operator=(DWARFContext &); // = delete
@@ -57,6 +59,9 @@
   /// Get a pointer to the parsed DebugAranges object.
   const DWARFDebugAranges *getDebugAranges();
 
+  /// Get a pointer to the parsed DWARFDebugLine object.
+  const DWARFDebugLine *getDebugLine();
+
   bool isLittleEndian() const { return IsLittleEndian; }
 
   virtual StringRef getInfoSection() = 0;