dwarfdump: Added macro support to llvm-dwarfdump tool.

Added "macro" option to "-debug-dump" flag, which trigger parsing and dumping of the ".debug_macinfo" section.

Differential Revision: http://reviews.llvm.org/D14294

llvm-svn: 252866
diff --git a/llvm/lib/Support/Dwarf.cpp b/llvm/lib/Support/Dwarf.cpp
index 5764e45..dd74038 100644
--- a/llvm/lib/Support/Dwarf.cpp
+++ b/llvm/lib/Support/Dwarf.cpp
@@ -468,6 +468,7 @@
   case DW_MACINFO_start_file:            return "DW_MACINFO_start_file";
   case DW_MACINFO_end_file:              return "DW_MACINFO_end_file";
   case DW_MACINFO_vendor_ext:            return "DW_MACINFO_vendor_ext";
+  case DW_MACINFO_invalid:               return "DW_MACINFO_invalid";
   }
   return nullptr;
 }