Driver: pass `-target` immediately after clang++ (NFC)
Driver: pass `-target` immediately after clang++ (NFC)

This just adjusts the command invocation for the driver.  It makes it
clear that the `clang` invocation was correct.

stephentyrone/swift,devincoughlin/swift,benlangmuir/swift,shahmishal/swift,rudkx/swift,stephentyrone/swift,lorentey/swift,allevato/swift,gregomni/swift,harlanhaskins/swift,JGiola/swift,apple/swift,lorentey/swift,jmgc/swift,allevato/swift,lorentey/swift,karwa/swift,gribozavr/swift,xwu/swift,shahmishal/swift,glessard/swift,stephentyrone/swift,stephentyrone/swift,rudkx/swift,parkera/swift,jckarter/swift,benlangmuir/swift,rudkx/swift,tkremenek/swift,ahoppen/swift,xwu/swift,parkera/swift,roambotics/swift,jckarter/swift,xwu/swift,tkremenek/swift,karwa/swift,atrick/swift,parkera/swift,aschwaighofer/swift,glessard/swift,roambotics/swift,JGiola/swift,karwa/swift,jmgc/swift,aschwaighofer/swift,airspeedswift/swift,JGiola/swift,nathawes/swift,nathawes/swift,atrick/swift,airspeedswift/swift,karwa/swift,aschwaighofer/swift,allevato/swift,atrick/swift,airspeedswift/swift,xwu/swift,jmgc/swift,gribozavr/swift,aschwaighofer/swift,shahmishal/swift,airspeedswift/swift,jmgc/swift,stephentyrone/swift,rudkx/swift,ahoppen/swift,JGiola/swift,shahmishal/swift,harlanhaskins/swift,sschiau/swift,rudkx/swift,apple/swift,allevato/swift,gregomni/swift,gregomni/swift,airspeedswift/swift,devincoughlin/swift,jmgc/swift,jckarter/swift,karwa/swift,jmgc/swift,sschiau/swift,hooman/swift,harlanhaskins/swift,glessard/swift,shahmishal/swift,lorentey/swift,devincoughlin/swift,benlangmuir/swift,tkremenek/swift,aschwaighofer/swift,roambotics/swift,benlangmuir/swift,gribozavr/swift,allevato/swift,jckarter/swift,rudkx/swift,benlangmuir/swift,nathawes/swift,glessard/swift,CodaFi/swift,airspeedswift/swift,karwa/swift,CodaFi/swift,tkremenek/swift,CodaFi/swift,hooman/swift,jmgc/swift,devincoughlin/swift,shahmishal/swift,shahmishal/swift,harlanhaskins/swift,parkera/swift,CodaFi/swift,jckarter/swift,tkremenek/swift,CodaFi/swift,karwa/swift,JGiola/swift,gribozavr/swift,roambotics/swift,hooman/swift,stephentyrone/swift,hooman/swift,allevato/swift,parkera/swift,sschiau/swift,nathawes/swift,ahoppen/swift,nathawes/swift,benlangmuir/swift,gregomni/swift,gregomni/swift,xwu/swift,sschiau/swift,shahmishal/swift,ahoppen/swift,parkera/swift,sschiau/swift,sschiau/swift,CodaFi/swift,xwu/swift,apple/swift,harlanhaskins/swift,sschiau/swift,lorentey/swift,atrick/swift,glessard/swift,harlanhaskins/swift,airspeedswift/swift,sschiau/swift,parkera/swift,apple/swift,JGiola/swift,devincoughlin/swift,harlanhaskins/swift,roambotics/swift,jckarter/swift,gregomni/swift,gribozavr/swift,karwa/swift,hooman/swift,devincoughlin/swift,nathawes/swift,xwu/swift,ahoppen/swift,gribozavr/swift,tkremenek/swift,gribozavr/swift,tkremenek/swift,atrick/swift,apple/swift,lorentey/swift,ahoppen/swift,allevato/swift,parkera/swift,CodaFi/swift,lorentey/swift,devincoughlin/swift,aschwaighofer/swift,glessard/swift,gribozavr/swift,roambotics/swift,aschwaighofer/swift,stephentyrone/swift,devincoughlin/swift,lorentey/swift,hooman/swift,apple/swift,atrick/swift,jckarter/swift,nathawes/swift,hooman/swift