Add a host parameter to ObjectVisitor methods.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index f8e0da0b5de4d0c97cbbae8363e6bbee9f96ad48..fe415800520571a6763bb45ab976043938f5421e 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -10151,47 +10151,52 @@ class ObjectVisitor BASE_EMBEDDED {
 
   // Visits a contiguous arrays of pointers in the half-open range
   // [start, end). Any or all of the values may be modified on return.
-  virtual void VisitPointers(Object** start, Object** end) = 0;
+  virtual void VisitPointers(HeapObject* host, Object** start,
+                             Object** end) = 0;
 
   // Handy shorthand for visiting a single pointer.
-  virtual void VisitPointer(Object** p) { VisitPointers(p, p + 1); }
+  virtual void VisitPointer(HeapObject* host, Object** p) {
+    VisitPointers(host, p, p + 1);
+  }
 
   // Visit weak next_code_link in Code object.
-  virtual void VisitNextCodeLink(Object** p) { VisitPointers(p, p + 1); }
+  virtual void VisitNextCodeLink(Code* host, Object** p) {
+    VisitPointers(host, p, p + 1);
+  }
 
   // To allow lazy clearing of inline caches the visitor has
   // a rich interface for iterating over Code objects..
 
   // Visits a code target in the instruction stream.
-  virtual void VisitCodeTarget(RelocInfo* rinfo);
+  virtual void VisitCodeTarget(Code* host, RelocInfo* rinfo);
 
   // Visits a code entry in a JS function.
-  virtual void VisitCodeEntry(Address entry_address);
+  virtual void VisitCodeEntry(JSFunction* host, Address entry_address);
 
   // Visits a global property cell reference in the instruction stream.
-  virtual void VisitCell(RelocInfo* rinfo);
+  virtual void VisitCell(Code* host, RelocInfo* rinfo);
 
   // Visits a runtime entry in the instruction stream.
-  virtual void VisitRuntimeEntry(RelocInfo* rinfo) {}
+  virtual void VisitRuntimeEntry(Code* host, RelocInfo* rinfo) {}
 
   // Visits a debug call target in the instruction stream.
-  virtual void VisitDebugTarget(RelocInfo* rinfo);
+  virtual void VisitDebugTarget(Code* host, RelocInfo* rinfo);
 
   // Visits the byte sequence in a function's prologue that contains information
   // about the code's age.
-  virtual void VisitCodeAgeSequence(RelocInfo* rinfo);
+  virtual void VisitCodeAgeSequence(Code* host, RelocInfo* rinfo);
 
   // Visit pointer embedded into a code object.
-  virtual void VisitEmbeddedPointer(RelocInfo* rinfo);
+  virtual void VisitEmbeddedPointer(Code* host, RelocInfo* rinfo);
 
   // Visits an external reference embedded into a code object.
-  virtual void VisitExternalReference(RelocInfo* rinfo);
+  virtual void VisitExternalReference(Code* host, RelocInfo* rinfo) {}
 
   // Visits an external reference.
-  virtual void VisitExternalReference(Address* p) {}
+  virtual void VisitExternalReference(Foreign* host, Address* p) {}
 
   // Visits an (encoded) internal reference.
-  virtual void VisitInternalReference(RelocInfo* rinfo) {}
+  virtual void VisitInternalReference(Code* host, RelocInfo* rinfo) {}
 };