Preserve SourceRanges across serialization (#22179)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22179
ghimport-source-id: 9879551127da09d78ca348b9e436db5a09a92a38
Test Plan: Imported from OSS
Differential Revision: D15981423
Pulled By: jamesr66a
fbshipit-source-id: a2506f5a2f05916b6e8226841b0229110e758671
