Remove RegionPolicy in PostGenericScheduler to fix test failure

Author: wangpc-pp

llvm/include/llvm/CodeGen/MachineScheduler.h

@@ -1297,7 +1297,6 @@ class PostGenericScheduler : public GenericSchedulerBase {
   ScheduleDAGMI *DAG = nullptr;
   SchedBoundary Top;
   SchedBoundary Bot;
-  MachineSchedPolicy RegionPolicy;
 
   /// Candidate last picked from Top boundary.
   SchedCandidate TopCand;