Add support for nested var names in parser (#75124)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75124
These occur with freezing cc Krovatkin
Test Plan: Imported from OSS
Reviewed By: ejguan
Differential Revision: D35373998
Pulled By: eellison
fbshipit-source-id: c043d728900f833b8d027ff75b088f9d3eb389e0
(cherry picked from commit 89dc6185d0abbe9921bae817097ed7a55b658416)
