improvements to QualifiedName (#22204)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22204
ghimport-source-id: 319afc622f7137ca9075efefca1a05acedc19a4a
Test Plan: Imported from OSS
Differential Revision: D15998759
Pulled By: suo
fbshipit-source-id: 4534443aef61255af0fa3d2ed1be5e87266e2f2c
