[SPMD] Refactor DSize to DSymInt to enable sym_numel (#99206)
This commit uses `aten.arange.default` and `aten.arange.start` to
test `aten.sym_numel`.
Differential Revision: [](https://our.internmc.facebook.com/intern/diff/)
Differential Revision: [D45028715](https://our.internmc.facebook.com/intern/diff/D45028715)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/99206
Approved by: https://github.com/yifuwang
