In __getitem__, convert integers to int64 Tensor not int32 to be compatible with Lite(#31658)

python/paddle/fluid/framework.py

@@ -877,7 +877,7 @@ def _getitem_impl_(var, item):
                 new_list_tensor.append(dim)
             else:
                 assert (isinstance(dim, int))
-                temp_out = var.block.create_var(dtype='int32')
+                temp_out = var.block.create_var(dtype='int64')
                 fill_constant([1], dim, force_cpu=True, out=temp_out)
                 new_list_tensor.append(temp_out)
         return new_list_tensor