DWARF: Port support for parsing .debug_aranges section from LLDB and wire it up to llvm-dwarfdump.

This is only one half of it, the part that caches address ranges from the DIEs when .debug_aranges is
not available will be ported soon.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139680 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/DebugInfo/DWARFContext.h b/lib/DebugInfo/DWARFContext.h
index 1a70f3f..3eca952 100644
--- a/lib/DebugInfo/DWARFContext.h
+++ b/lib/DebugInfo/DWARFContext.h
@@ -11,14 +11,13 @@
 #define LLVM_DEBUGINFO_DWARFCONTEXT_H
 
 #include "DWARFCompileUnit.h"
+#include "DWARFDebugAranges.h"
 #include "llvm/DebugInfo/DIContext.h"
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/ADT/SmallVector.h"
 
 namespace llvm {
 
-class DWARFDebugAbbrev;
-
 /// DWARFContext
 /// This data structure is the top level entity that deals with dwarf debug
 /// information parsing. The actual data is supplied through pure virtual
@@ -28,6 +27,7 @@
 
   SmallVector<DWARFCompileUnit, 1> CUs;
   OwningPtr<DWARFDebugAbbrev> Abbrev;
+  OwningPtr<DWARFDebugAranges> Aranges;
 
   DWARFContext(DWARFContext &); // = delete
   DWARFContext &operator=(DWARFContext &); // = delete
@@ -54,6 +54,9 @@
   /// Get a pointer to the parsed DebugAbbrev object.
   const DWARFDebugAbbrev *getDebugAbbrev();
 
+  /// Get a pointer to the parsed DebugAranges object.
+  const DWARFDebugAranges *getDebugAranges();
+
   bool isLittleEndian() const { return IsLittleEndian; }
 
   virtual StringRef getInfoSection() = 0;