Update V8 to r5295 as required by WebKit r65615

Change-Id: I1d72d4990703e88b7798919c7a53e12ebf76958a
diff --git a/src/utils.h b/src/utils.h
index 236b85e..d15319c 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -739,7 +739,11 @@
   return dest;
 }
 
-} }  // namespace v8::internal
+template <class Dest, class Source>
+inline Dest BitCast(Source* const & source) {
+    return BitCast<Dest>(reinterpret_cast<uintptr_t>(source));
+}
 
+} }  // namespace v8::internal
 
 #endif  // V8_UTILS_H_