Port "arc upgrade" to Toolsets

Authored by epriestley on Feb 17 2020, 5:32 PM.


Port "arc upgrade" to Toolsets

Summary: Ref T13490. Allows "arc upgrade" to run through the new Toolsets infrastructure.

Test Plan: Ran "arc upgrade", although you can't upgrade feature branches so this can't be entirely tested until it hits "master".

Maniphest Tasks: T13490

Differential Revision: https://secure.phabricator.com/D21006