[heap] Rework and improve object stats tracing

src/heap/incremental-marking.cc

Index: src/heap/incremental-marking.cc
diff --git a/src/heap/incremental-marking.cc b/src/heap/incremental-marking.cc
index f578d43b474481c6b8acb984f53210fbc3366579..b29e5ea17b4de536095e40eda803df0e5228d07d 100644
--- a/src/heap/incremental-marking.cc
+++ b/src/heap/incremental-marking.cc
@@ -176,9 +176,6 @@ class IncrementalMarkingMarkingVisitor
     table_.Register(kVisitFixedArray, &VisitFixedArrayIncremental);
     table_.Register(kVisitNativeContext, &VisitNativeContextIncremental);
     table_.Register(kVisitJSRegExp, &VisitJSRegExp);
-    if (FLAG_track_gc_object_stats) {
-      IncrementalMarkingObjectStatsVisitor::Initialize(&table_);
-    }
   }
 
   static const int kProgressBarScanningChunk = 32 * 1024;