RequirementMachine: Factor out lookupMemberType() utility in RequirementLowering.cpp
RequirementMachine: Factor out lookupMemberType() utility in RequirementLowering.cpp

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