Clean-up and repair cumulative marking and sweeping time stats.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 67ee043e0b1168d49e5fef8914fc9535cc575600..8f06e9c0a428e1315fa793998e4708c31dc3e1af 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -5206,8 +5206,8 @@ void Heap::TearDown() {
     PrintF("min_in_mutator=%.1f ", get_min_in_mutator());
     PrintF("max_alive_after_gc=%" V8_PTR_PREFIX "d ",
            get_max_alive_after_gc());
-    PrintF("total_marking_time=%.1f ", marking_time());
-    PrintF("total_sweeping_time=%.1f ", sweeping_time());
+    PrintF("total_marking_time=%.1f ", tracer_.cumulative_sweeping_duration());
+    PrintF("total_sweeping_time=%.1f ", tracer_.cumulative_sweeping_duration());
     PrintF("\n\n");
   }