make this testcase more robust against dead code elimination.
make this testcase more robust against dead code elimination.

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itjammer/swift,austinzheng/swift,danielmartin/swift,djwbrown/swift,glessard/swift,xwu/swift,xedin/swift,codestergit/swift,ben-ng/swift,tinysun212/swift-windows,huonw/swift,sschiau/swift,karwa/swift,zisko/swift,practicalswift/swift,swiftix/swift,modocache/swift,uasys/swift,airspeedswift/swift,lorentey/swift,rudkx/swift,jmgc/swift,swiftix/swift,kstaring/swift,jopamer/swift,ahoppen/swift,frootloops/swift,austinzheng/swift,airspeedswift/swift,Jnosh/swift,benlangmuir/swift,tardieu/swift,CodaFi/swift,jopamer/swift,kstaring/swift,jckarter/swift,benlangmuir/swift,manavgabhawala/swift,therealbnut/swift,aschwaighofer/swift,OscarSwanros/swift,glessard/swift,jtbandes/swift,parkera/swift,lorentey/swift,JGiola/swift,harlanhaskins/swift,zisko/swift,gottesmm/swift,kstaring/swift,danielmartin/swift,felix91gr/swift,Jnosh/swift,tkremenek/swift,arvedviehweger/swift,tardieu/swift,modocache/swift,zisko/swift,return/swift,jtbandes/swift,practicalswift/swift,xedin/swift,karwa/swift,therealbnut/swift,frootloops/swift,devincoughlin/swift,hughbe/swift,devincoughlin/swift,kstaring/swift,sschiau/swift,brentdax/swift,danielmartin/swift,natecook1000/swift,natecook1000/swift,shajrawi/swift,nathawes/swift,alblue/swift,zisko/swift,amraboelela/swift,gribozavr/swift,jckarter/swift,aschwaighofer/swift,practicalswift/swift,allevato/swift,harlanhaskins/swift,deyton/swift,alblue/swift,amraboelela/swift,glessard/swift,IngmarStein/swift,kperryua/swift,frootloops/swift,huonw/swift,parkera/swift,IngmarStein/swift,modocache/swift,glessard/swift,parkera/swift,gribozavr/swift,shahmishal/swift,gottesmm/swift,shahmishal/swift,swiftix/swift,stephentyrone/swift,jmgc/swift,shahmishal/swift,frootloops/swift,natecook1000/swift,swiftix/swift,huonw/swift,amraboelela/swift,xwu/swift,aschwaighofer/swift,alblue/swift,IngmarStein/swift,modocache/swift,therealbnut/swift,jtbandes/swift,calebd/swift,karwa/swift,amraboelela/swift,ben-ng/swift,milseman/swift,swiftix/swift,CodaFi/swift,kstaring/swift,CodaFi/swift,aschwaighofer/swift,IngmarStein/swift,allevato/swift,jopamer/swift,xwu/swift,uasys/swift,harlanhaskins/swift,kperryua/swift,jtbandes/swift,apple/swift,stephentyrone/swift,nathawes/swift,xedin/swift,tjw/swift,lorentey/swift,return/swift,kperryua/swift,xwu/swift,gregomni/swift,rudkx/swift,hughbe/swift,practicalswift/swift,huonw/swift,devincoughlin/swift,Jnosh/swift,lorentey/swift,hughbe/swift,aschwaighofer/swift,gmilos/swift,rudkx/swift,ben-ng/swift,JaSpa/swift