Don't substitute in symbolic shapes to shape compute graph (#59811)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59811
We don't want to actually substitute in symbolic shapes, because it invalidates the partially evaluated graph for further use.
Test Plan: Imported from OSS
Reviewed By: pbelevich, zhxchen17
Differential Revision: D30200059
Pulled By: eellison
fbshipit-source-id: 267ed97d8421fe480dec494cdf0dec9cf9ed3ba2
