Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69614
Previously sparse COO tensors were ignored during freezing, because
`tryInsertConstant` would fail during `freeze_module.cpp`, and because
hashes weren't implemented for COO tensor IValues.
Test Plan: Imported from OSS
Reviewed By: mrshenli
Differential Revision: D32954620
Pulled By: davidberard98
fbshipit-source-id: a91f97fdfc2152b417f43a6948100c94970c0831
