Fix sil-opt -opt-mode=none
Fix sil-opt -opt-mode=none

Set the single-pass pipeline's isMandatory flag based on the opt-mode.

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