Remove unused function argument, add a bit to the comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168387 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 5b281fe..009f8d1 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -357,9 +357,10 @@
   ///
   void emitDIE(DIE *Die);
 
-  /// computeSizeAndOffset - Compute the size and offset of a DIE.
+  /// computeSizeAndOffset - Compute the size and offset of a DIE given
+  /// an incoming Offset.
   ///
-  unsigned computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last);
+  unsigned computeSizeAndOffset(DIE *Die, unsigned Offset);
 
   /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
   ///