This method inverts the Reason field of a scheduling candidate.
It does right comparison between RegCritical and RegExcess, but
everything else is broken. In fact it can prefer less strong reason
such as Weak over RegCritical because Weak > -RegCritical.
The CandReason enum is properly sorted, so just remove artificial
ranking.
Differential Revision: https://reviews.llvm.org/D30557
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297536 91177308-0d34-0410-b5e6-96231b3b80d8