Introduce instance type for transition arrays.

src/heap/objects-visiting.cc

Index: src/heap/objects-visiting.cc
diff --git a/src/heap/objects-visiting.cc b/src/heap/objects-visiting.cc
index dfc284f4701b68d6f4b454bf5d14e6c8e5e52fe6..b44b650b04edaadacfdf832b0c9871bdfbc7bc08 100644
--- a/src/heap/objects-visiting.cc
+++ b/src/heap/objects-visiting.cc
@@ -79,6 +79,9 @@ StaticVisitorBase::VisitorId StaticVisitorBase::GetVisitorId(
     case WEAK_CELL_TYPE:
       return kVisitWeakCell;
 
+    case TRANSITION_ARRAY_TYPE:
+      return kVisitTransitionArray;
+
     case JS_WEAK_MAP_TYPE:
     case JS_WEAK_SET_TYPE:
       return kVisitJSWeakCollection;