rsx fifo: Stability improvements

* Restore stack in fifo error handling

* Update get register after the cmd execution

* Fix put pause in the middle of command

* Add restore points when branching to self

* Precise nopcmd detection

* Test all invalid cmds for early treatment of queue corruption

rpcs3/Emu/RSX/RSXThread.cpp

@@ -676,6 +676,7 @@ namespace rsx
 			if (sync_point_request)
 			{
 				restore_point = ctrl->get;
+				restore_ret = m_return_addr;
 				sync_point_request = false;
 			}