Introduce instance type for transition arrays.

src/heap/objects-visiting.h

Index: src/heap/objects-visiting.h
diff --git a/src/heap/objects-visiting.h b/src/heap/objects-visiting.h
index 5d2176186fdbd215ce6f6a93ac66eccc5ed43edd..f0925a71c7fdeba2dce02d2c8629a4d227529d25 100644
--- a/src/heap/objects-visiting.h
+++ b/src/heap/objects-visiting.h
@@ -76,6 +76,7 @@ class StaticVisitorBase : public AllStatic {
   V(Cell)                  \
   V(PropertyCell)          \
   V(WeakCell)              \
+  V(TransitionArray)       \
   V(SharedFunctionInfo)    \
   V(JSFunction)            \
   V(JSWeakCollection)      \
@@ -347,6 +348,7 @@ class StaticMarkingVisitor : public StaticVisitorBase {
 
   INLINE(static void VisitPropertyCell(Map* map, HeapObject* object));
   INLINE(static void VisitWeakCell(Map* map, HeapObject* object));
+  INLINE(static void VisitTransitionArray(Map* map, HeapObject* object));
   INLINE(static void VisitCodeEntry(Heap* heap, HeapObject* object,
                                     Address entry_address));
   INLINE(static void VisitEmbeddedPointer(Heap* heap, RelocInfo* rinfo));