Add a host parameter to ObjectVisitor methods.

src/heap/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 2471 matching lines @@
 };
 
 
 // Visitor class to verify interior pointers in spaces that do not contain
 // or care about intergenerational references. All heap object pointers have to
 // point into the heap to a location that has a map pointer at its first word.
 // Caveat: Heap::Contains is an approximation because it can return true for
 // objects in a heap space but above the allocation pointer.
 class VerifyPointersVisitor : public ObjectVisitor, public RootVisitor {
  public:
-  inline void VisitPointers(Object** start, Object** end) override;
+  inline void VisitPointers(HeapObject* host, Object** start,
+                            Object** end) override;
   inline void VisitRootPointers(Root root, Object** start,
                                 Object** end) override;
 
  private:
   inline void VerifyPointers(Object** start, Object** end);
 };
 
 
 // Verify that all objects are Smis.
 class VerifySmisVisitor : public RootVisitor {
@@ skipping 157 matching lines @@
   friend class PagedSpace;
   DISALLOW_COPY_AND_ASSIGN(AllocationObserver);
 };
 
 V8_EXPORT_PRIVATE const char* AllocationSpaceName(AllocationSpace space);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_