Enable JIT to be able to use the Stalker API

src/frida/discoverer.py

@@ -22,6 +22,7 @@ class Discoverer(object):
     def start(self, session, ui):
         def on_message(message, data):
             self._reactor.schedule(lambda: self._process_message(message, data, session, ui))
+        session.enable_jit()
         self._script = session.create_script(name="discoverer", source=self._create_discover_script())
         self._script.on('message', on_message)
         self._script.load()