[Dependency scanning] Make test order-invariant.
[Dependency scanning] Make test order-invariant.

Fixes rdar://problem/62473147, I hope.

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