cpus: properly kick CPUs out of inner execution loop

Now that cpu_exit() actually kicks all accelerators, use it whenever
the message to another thread is processed in qemu_wait_io_event().

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

replay/replay-events.c

@@ -118,7 +118,8 @@ void replay_add_event(ReplayAsyncEventKind event_kind,
 
     g_assert(replay_mutex_locked());
     QTAILQ_INSERT_TAIL(&events_list, event, events);
-    qemu_cpu_kick(first_cpu);
+    /* Kick the TCG thread out of tcg_cpu_exec().  */
+    cpu_exit(first_cpu);
 }
 
 void replay_bh_schedule_event(QEMUBH *bh)