Add a host parameter to ObjectVisitor methods.

src/heap/concurrent-marking.cc

Index: src/heap/concurrent-marking.cc
diff --git a/src/heap/concurrent-marking.cc b/src/heap/concurrent-marking.cc
index d47eea01153ae0610c43323e038a25e24810da98..9be1103c65515f8d0d528f5b255cdf8f2a45d2b0 100644
--- a/src/heap/concurrent-marking.cc
+++ b/src/heap/concurrent-marking.cc
@@ -52,7 +52,7 @@ class ConcurrentMarkingVisitor : public ObjectVisitor {
  public:
   ConcurrentMarkingVisitor() {}
 
-  void VisitPointers(Object** start, Object** end) override {
+  void VisitPointers(HeapObject* host, Object** start, Object** end) override {
     for (Object** p = start; p < end; p++) {
       if (!(*p)->IsHeapObject()) continue;
       MarkObject(HeapObject::cast(*p));