R1:259b40fc28e3

Fix some method visibilities

Summary: See D13185, the `testMethodVisibility()` test was not being executed.

Test Plan: `arc unit`

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D13186