[L0 v2] fix destruction order in event_pool

by changing order of members.

Provider should be destroyed last, after all ur_events are destroyed
(ur_event dtor can put ze_event_handle_t back to the provider's cache).

Author: igchor

source/adapters/level_zero/v2/event_pool.hpp

@@ -43,10 +43,10 @@ class event_pool {
   void free(ur_event *event);
 
 private:
+  std::unique_ptr<event_provider> provider;
+
   std::deque<ur_event> events;
   std::vector<ur_event *> freelist;
-
-  std::unique_ptr<event_provider> provider;
 };
 
 } // namespace v2