RequirementMachine: Don't skip subst-simplified rules when importing
RequirementMachine: Don't skip subst-simplified rules when importing

Property map construction is still not incremental, and considers
all rules. Skipping subst-simplified rules here violates invariants
checked by the next commit.

roambotics/swift,ahoppen/swift,apple/swift,glessard/swift,benlangmuir/swift,ahoppen/swift,JGiola/swift,benlangmuir/swift,apple/swift,atrick/swift,benlangmuir/swift,ahoppen/swift,rudkx/swift,rudkx/swift,roambotics/swift,glessard/swift,atrick/swift,apple/swift,atrick/swift,gregomni/swift,roambotics/swift,ahoppen/swift,rudkx/swift,atrick/swift,roambotics/swift,gregomni/swift,roambotics/swift,benlangmuir/swift,glessard/swift,JGiola/swift,roambotics/swift,atrick/swift,gregomni/swift,JGiola/swift,apple/swift,JGiola/swift,ahoppen/swift,rudkx/swift,glessard/swift,rudkx/swift,glessard/swift,JGiola/swift,benlangmuir/swift,apple/swift,apple/swift,JGiola/swift,glessard/swift,gregomni/swift,atrick/swift,gregomni/swift,ahoppen/swift,rudkx/swift,benlangmuir/swift,gregomni/swift