R1:2a29a51080e1

Deploy new ArcanistManyWordsAboutDifferentialConstants class from D1328 into
Phabricator

Summary: ...this breaks without D1328. Used good ole "codemod" to do this
work, with lots of manual edits around 80 chars.

Test Plan: clicked around phabricator tool suite, particular differential, a
bunch

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D1351