Update V8 to r5295 as required by WebKit r65615

Change-Id: I1d72d4990703e88b7798919c7a53e12ebf76958a
diff --git a/src/list.h b/src/list.h
index d3c2767..9abf61c 100644
--- a/src/list.h
+++ b/src/list.h
@@ -117,6 +117,8 @@
 
   // Iterate through all list entries, starting at index 0.
   void Iterate(void (*callback)(T* x));
+  template<class Visitor>
+  void Iterate(Visitor* visitor);
 
   // Sort all list entries (using QuickSort)
   void Sort(int (*cmp)(const T* x, const T* y));