EraseNumberTypes cleans itself up (#22461)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22461
We shouldn't call dead code elimination after EraseNumberTypes because dead code elimination assumes a valid jit graph which EraseNumberTypes just broke.
Let's have it clean up itself isntead.
Reviewed By: houseroad
Differential Revision: D16094656
fbshipit-source-id: f2752277d764e78ab276c57d56b2724b872b136f
