In a large application I profiled allocations while running `bundle
update` and found that this method was ~60% of allocations while
resolving (and Candidate#<=> is almost half of the total runtime).
This commit removes the array allocation in Candidate#<=> (and similar
methods since the implementations are so simple). The array is always
the same two elements so they can just be compared directly.
6a7c411ba7
Instead of having to do a complete pass after resolve.
To do this, we add to the ruby group all the platform specs with the
same dependencies as the ruby specs.
e50415f2a6
