Fix marking time in cumulative gc stats.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 5c8cd4528ac86115c632826d15db5e36b2e2bdde..8dcd42829b776d1d8802f96f51a9368c36f3ca1e 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -5304,7 +5304,7 @@ void Heap::TearDown() {
     PrintF("total_gc_time=%.1f ", total_gc_time_ms_);
     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 ", tracer_.cumulative_sweeping_duration());
+    PrintF("total_marking_time=%.1f ", tracer_.cumulative_marking_duration());
     PrintF("total_sweeping_time=%.1f ", tracer_.cumulative_sweeping_duration());
     PrintF("\n\n");
   }