[test] make a constant_struct_with_padding work when cross-compiling.
[test] make a constant_struct_with_padding work when cross-compiling.

Addresses rdar://problem/29173452.

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