Add `GRAPH_UPDATE` for `x.size()` in Peephole Optimize (#34865)
Summary:
Fix https://github.com/pytorch/pytorch/issues/31820
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34865
Reviewed By: jamesr66a
Differential Revision: D20772078
Pulled By: suo
fbshipit-source-id: cddf870e23983cc42da898edf3f98897353b2abe
