Summary:
The test is just a copy of the existing one but with perfhack enabled. It's
expected to generate the same test result.
Test Plan: Run the newly added tests
Reviewers: #sourcecontrol, stash
Reviewed By: stash
Subscribers: mjpieters
Differential Revision: https://phabricator.intern.facebook.com/D3937109
Signature: t1:3937109:1475166970:4c39d9b15878458cd8b4a26323749224a4c3c746
