Added dead register to DCE message.

src/optimize/advanced.py

@@ -404,8 +404,8 @@ def eliminate_dead_code(block):
                 if block.debug:
                     s.stype = 'comment'
                     s.options['block'] = False
-                    s.name = ' Dead:\t%s\t%s' \
-                            % (s.name, ','.join(map(str, s)))
+                    s.name = ' Dead:\t%s\t%s (dead register %s)' \
+                            % (s.name, ','.join(map(str, s)), reg)
                 else:
                     s.remove = True