Make the GC aware of JSReceiver pointers in LookupResults.

src/property.cc

Index: src/property.cc
diff --git a/src/property.cc b/src/property.cc
index 7cc2df5a3c9b1a5bca52f192873432ac5c9799db..6e043e2685e6609fb305ebf477920e8c3d4b188b 100644
--- a/src/property.cc
+++ b/src/property.cc
@@ -31,6 +31,15 @@ namespace v8 {
 namespace internal {
 
 
+void LookupResult::Iterate(ObjectVisitor* visitor) {
+  LookupResult* current = this;  // Could be NULL.
+  while (current != NULL) {
+    visitor->VisitPointer(BitCast<Object**>(&current->holder_));
+    current = current->next_;
+  }
+}
+
+
 #ifdef OBJECT_PRINT
 void LookupResult::Print(FILE* out) {
   if (!IsFound()) {