Make "arc land" support landing someone else's code that got there via arc patch
Make "arc land" support landing someone else's code that got there via arc patch

Summary: Ref T4670.

Test Plan: arc patch D8685; arc land --hold; verified i got a nice message asking me to be sure i wanted to land epriestley's code

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T4670

Differential Revision: https://secure.phabricator.com/D8709

memsql/arcanist,jra3/arcanist,folsom-labs/arcanist,zhihu/arcanist,chundongwang/arcanist,zhihu/arcanist,calblueprint/arcanist,wxstars/arcanist,wharris/arcanist,fivestars/arcanist,codelabs-ch/arcanist,calblueprint/arcanist,aik099/arcanist,alexmv/arcanist,sneakpeeq/arcanist,KieranHayes/arcanist,r4nt/arcanist,KieranHayes/arcanist,jra3/arcanist,wikimedia/phabricator-arcanist,Khan/arcanist,alexmv/arcanist,KieranHayes/arcanist,memsql/arcanist,r4nt/arcanist,fivestars/arcanist,coursera/arcanist,eSpark/arcanist,dguo-coursera/arcanist,fivestars/arcanist,Symplicity/arcanist,kevinseelbach/arcanist,Symplicity/arcanist,KieranHayes/arcanist,chundongwang/arcanist,kevinseelbach/arcanist,fivestars/arcanist,hach-que/arcanist,folsom-labs/arcanist,zhihu/arcanist,sneakpeeq/arcanist,wxstars/arcanist,memsql/arcanist,PageUpPeopleOrg/arcanist-patches,coursera/arcanist,alexmv/arcanist,wharris/arcanist,uber/arcanist,calblueprint/arcanist,wharris/arcanist,aik099/arcanist,dguo-coursera/arcanist,haskell-infra/arcanist,aik099/arcanist,r4nt/arcanist,kevinseelbach/arcanist,codelabs-ch/arcanist,dguo-coursera/arcanist,aik099/arcanist,coursera/arcanist,phacility/arcanist,PageUpPeopleOrg/arcanist-patches,sneakpeeq/arcanist,jra3/arcanist,calblueprint/arcanist,Khan/arcanist,uber/arcanist,folsom-labs/arcanist,alexmv/arcanist,wikimedia/phabricator-arcanist,hach-que/arcanist,wharris/arcanist,PageUpPeopleOrg/arcanist-patches,phacility/arcanist,jra3/arcanist,folsom-labs/arcanist,phacility/arcanist,kevinseelbach/arcanist,uber/arcanist,coursera/arcanist,haskell-infra/arcanist,codelabs-ch/arcanist,uber/arcanist,phacility/arcanist,r4nt/arcanist,Khan/arcanist,wikimedia/phabricator-arcanist,zhihu/arcanist,wxstars/arcanist,phacility/arcanist,codelabs-ch/arcanist,Khan/arcanist,codelabs-ch/arcanist,wxstars/arcanist,eSpark/arcanist,Symplicity/arcanist,PageUpPeopleOrg/arcanist-patches,wikimedia/phabricator-arcanist,hach-que/arcanist,eSpark/arcanist,dguo-coursera/arcanist,sneakpeeq/arcanist,haskell-infra/arcanist,haskell-infra/arcanist,Symplicity/arcanist,eSpark/arcanist,hach-que/arcanist,memsql/arcanist,chundongwang/arcanist,chundongwang/arcanist