[jit] Prevent caching of `graph` attribute. (#46960)
Summary:
`graph` is automatically cached even when the underlying graph changes -- this PR hardcodes a fix to that.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46960
Reviewed By: mrshenli
Differential Revision: D24582185
Pulled By: bwasti
fbshipit-source-id: 16aeeba251830886c92751dd5c9bda8699d62803
