--access checkout does ignore rollups

[matthiaskrgr]

trafficstars

when working with --access checkout, it seems like cbr still sends api calls to github in order to figure out the commits contained in a rollup instead of using the cloned repository.

[ehuss]

I don't think it is possible to get the information from the repository. It has to access the GitHub comment posted by the perf bot to know which artifacts to download.