Pass all ops to XLA with additional info about whether it's compound (#33908)
Summary:
This PR prepares us to allow XLA use `XLAPreAutograd` to override compound ops.
To do this we'll need to pass all ops, with additional infomation about whether it's compound or not for XLA to parse.
Companion PR: https://github.com/pytorch/xla/pull/1698
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33908
Differential Revision: D20149585
Pulled By: ailzhang
fbshipit-source-id: a93140e8a34548fcabcea454386d15df58177c1d
