pytorch

b59e8565 - Revert D17486465: [jit] Make `is_optional` check more robust

Revert D17486465: [jit] Make `is_optional` check more robust Test Plan: revert-hammer Differential Revision: D17486465 Original commit changeset: c513cef3bbc0 fbshipit-source-id: 567311c001d7dd0b7ab9ffe8bb894954bea583c9