Fix incorrect EnumValue serialization issue (#44891)
Summary:
Previously, `prim::EnumValue` is serialized to `ops.prim.EnumValue`, which doesn't have the right implementation to refine return type. This diff correctly serializes it to enum.value, thus fixing the issue.
Fixes https://github.com/pytorch/pytorch/issues/44892
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44891
Reviewed By: malfet
Differential Revision: D23818962
Pulled By: gmagogsfm
fbshipit-source-id: 6edfdf9c4b932176b08abc69284a916cab10081b
