Allow for source code comments at any level of indentation (#46548)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/46548
Test Plan: Imported from OSS
Reviewed By: navahgar
Differential Revision: D24434778
Pulled By: ansley
fbshipit-source-id: e24ed73d497381e02ef1155622641027ae34770a
