[jit][static runtime] Simplify the graph and add operator whitelist (#43024)
Summary:
This PR whitelists and simplifies graphs to help with development later on. Key to note in this PR is the use of both a pattern substitution and the registration of custom operators. This will likely be one of the main optimization types done in this folder.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43024
Reviewed By: hlu1
Differential Revision: D23114262
Pulled By: bwasti
fbshipit-source-id: e25aa3564dcc8a2b48cfd1561b3ee2a4780ae462
