handle reassignment to inf and nan (#30877)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30877
Previously, when the environment tried to reassign variables which had been assigned to "inf" or "nan" it would fail because they are not simple values. Constant prop exposed this, a test was failing internally because of it.
Test Plan: Imported from OSS
Reviewed By: Krovatkin
Differential Revision: D18861016
Pulled By: eellison
fbshipit-source-id: b9b72978a26a0b00b13bf8ea7685825551f5a541
