[heap] ObjectStats: Fix accounting for fixed array subtypes

src/heap/mark-compact.h

Index: src/heap/mark-compact.h
diff --git a/src/heap/mark-compact.h b/src/heap/mark-compact.h
index 969ab11cf38e05efa7ad4a3cfe9a614a14a6494b..6a238839b18eb55d6139f1d83cc159a85343532c 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -40,11 +40,9 @@ class ObjectMarking : public AllStatic {
     return MarkBitFrom(reinterpret_cast<Address>(obj));
   }
 
-#ifdef DEBUG
   static Marking::ObjectColor Color(HeapObject* obj) {
     return Marking::Color(ObjectMarking::MarkBitFrom(obj));
   }
-#endif
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ObjectMarking);
@@ -514,6 +512,8 @@ class MarkCompactCollector {
 
   void VisitAllObjects(HeapObjectVisitor* visitor);
 
+  void RecordObjectStats();
+
   // Finishes GC, performs heap verification if enabled.
   void Finish();