More comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168952 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index f47864a..b6b28fa 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -312,6 +312,8 @@
   // Holders for the various debug information flags that we might need to
   // have exposed. See accessor functions below for description.
   bool IsDarwinGDBCompat;
+
+  // DWARF5 Experimental Options
   bool HasDwarfAccelTables;
   bool HasDwarfFission;
 private: