!13540 [MD] release gil in pynative && GPU

From: @liyong126
Reviewed-by: @liucunwei,@heleiwang
Signed-off-by: @liucunwei

mindspore/ccsrc/backend/session/executor.cc

@@ -415,8 +415,10 @@ void Executor::RunOp(const SessionPtr &session, OpRunInfo *op_run_info, const Gr
       // Release GIL before calling into (potentially long-running) C++ code
       if (Py_IsInitialized()) {
         py::gil_scoped_release release;
-      }
         session->RunOpImpl(graph_info, op_run_info, input_tensors, outputs, tensors_mask);
+      } else {
+        session->RunOpImpl(graph_info, op_run_info, input_tensors, outputs, tensors_mask);
+      }
     }
   } else {
     auto task = std::make_shared<RunOpTask>();