[unittest/Sema] Use default target triple to fix Windows build
[unittest/Sema] Use default target triple to fix Windows build

atrick/swift,JGiola/swift,jmgc/swift,parkera/swift,roambotics/swift,hooman/swift,benlangmuir/swift,hooman/swift,tkremenek/swift,rudkx/swift,jmgc/swift,rudkx/swift,apple/swift,glessard/swift,tkremenek/swift,hooman/swift,rudkx/swift,glessard/swift,rudkx/swift,benlangmuir/swift,hooman/swift,jmgc/swift,xwu/swift,benlangmuir/swift,parkera/swift,glessard/swift,roambotics/swift,tkremenek/swift,hooman/swift,apple/swift,parkera/swift,tkremenek/swift,benlangmuir/swift,ahoppen/swift,JGiola/swift,apple/swift,ahoppen/swift,ahoppen/swift,gregomni/swift,ahoppen/swift,tkremenek/swift,JGiola/swift,glessard/swift,hooman/swift,benlangmuir/swift,atrick/swift,glessard/swift,parkera/swift,atrick/swift,jmgc/swift,JGiola/swift,gregomni/swift,tkremenek/swift,apple/swift,apple/swift,JGiola/swift,jmgc/swift,tkremenek/swift,gregomni/swift,atrick/swift,jmgc/swift,xwu/swift,JGiola/swift,xwu/swift,parkera/swift,parkera/swift,roambotics/swift,benlangmuir/swift,roambotics/swift,xwu/swift,glessard/swift,rudkx/swift,xwu/swift,apple/swift,rudkx/swift,atrick/swift,xwu/swift,atrick/swift,jmgc/swift,ahoppen/swift,gregomni/swift,roambotics/swift,ahoppen/swift,xwu/swift,roambotics/swift,parkera/swift,gregomni/swift,hooman/swift,gregomni/swift,parkera/swift