Elaborate on comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185586 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index ed2cb8e..1168e27 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1221,7 +1221,7 @@
 DwarfDebug::collectVariableInfo(const MachineFunction *MF,
                                 SmallPtrSet<const MDNode *, 16> &Processed) {
 
-  // collection info from MMI table.
+  // Grab the variable info that was squirreled away in the MMI side-table.
   collectVariableInfoFromMMITable(MF, Processed);
 
   for (SmallVectorImpl<const MDNode*>::const_iterator