Stanislav Mekhanoshin 79da2a7698 [AMDGPU] Remove getBidirectionalReasonRank ...

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

llvm-svn: 297536

2017-03-11 00:29:27 +00:00

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