first step to remove unsafe handles

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index a45caf4d4286f04ff7c1084d90d95ce2fa9181f1..7d2e1b9a1b8fd0d1b8fa26bd8fe3ff91b3c0e82e 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -28,6 +28,8 @@
 #include <stdlib.h>
 #include <limits>
 
+#define V8_ALLOW_ACCESS_TO_PERSISTENT_IMPLICIT
+
 #include "v8.h"
 
 #include "accessors.h"