WIP patch for attempting to fix event dependencies in pocl

retain-event-deps.patch

diff --git a/lib/CL/devices/common.c b/lib/CL/devices/common.c
index 075474c..a574b14 100644
--- a/lib/CL/devices/common.c
+++ b/lib/CL/devices/common.c
@@ -632,6 +632,7 @@ pocl_broadcast (cl_event brc_event)
           if (tmp->event == brc_event)
             {
               LL_DELETE (target->event->wait_list, tmp);
+              POname(clReleaseEvent) (tmp->event);
               pocl_mem_manager_free_event_node (tmp);
               break;
             }
diff --git a/lib/CL/pocl_util.c b/lib/CL/pocl_util.c
index d102a3a..b822ee5 100644
--- a/lib/CL/pocl_util.c
+++ b/lib/CL/pocl_util.c
@@ -269,6 +269,9 @@ pocl_create_event_sync(cl_event waiting_event,
   wait_list_item->event = notifier_event;
   LL_PREPEND (notifier_event->notify_list, notify_target);
   LL_PREPEND (waiting_event->wait_list, wait_list_item);
+
+  notifier_event->pocl_refcount++;
+
   POCL_UNLOCK_OBJ (waiting_event);
 
   return CL_SUCCESS;