Fix erase_number_types test (#23181)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23181
We can't run dead code elimination after erasing number types because dce relies on graph invariants that erase_number_types breaks.
Reviewed By: houseroad
Differential Revision: D16427819
fbshipit-source-id: d1b98a74d2558b14d4be692219691149689a93d8
