Optimize loading draft revisions
Summary:
This is killing us since D3615.
Maybe we should also change differential_inlinecomment index <commentID> to <commentID, authorPHID>.
Test Plan: Checked queries at /differential/ with comment drafts.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D3667