Consider contained types in alias analysis (#21431)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21431
ghimport-source-id: d86ce974a065ec572e71cfa14a8f6bdf48216da7
Reviewed By: jamesr66a
Differential Revision: D15718560
Pulled By: suo
fbshipit-source-id: a36ce907ab26be22f12bab6175797fe8b34721f1
