Most test runs cover multiple revisions. Having a link to just the last one is not very useful - there is no reason to expect that it's the one of interest.
Not sure if this should be inline or in a popover.
But the link we currently have to the last revision in range is clearly misleading, it should be either improved or removed in my opinion.
Created attachment 220086 [details] poposed patch
Committed <http://trac.webkit.org/r161124>.