Back out "[pytorch][PR] Support dataclasses in TorchScript"
Summary:
Original commit changeset: f5a792555c88
Original Phabricator Diff: D34398107 (https://github.com/pytorch/pytorch/commit/d00de0d43598522b8f6ab2de553b6aaf6768faa5)
Backing out as this broke fluent2 tests
Test Plan: sandcastle
Reviewed By: qihqi
Differential Revision: D34597363
fbshipit-source-id: 26bbe64b981aeb53b901cda61557614d9f28700e
(cherry picked from commit f17adfed8125ef84efaf2c8923c11a751eb7fb98)
