R1:901328088d25

Render inline comments somewhat-correctly on 1-up diffs

Summary: You can't interact with them yey, but do a less awful job of rendering them.

Test Plan: {F29204}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2009

Differential Revision: https://secure.phabricator.com/D4426