Work around a miscompile in NominalTypeDescriptor.FieldNames on arm64.
Work around a miscompile in NominalTypeDescriptor.FieldNames on arm64.

If the FieldNames data is exactly 4 or 8 or 16 bytes long then on arm64 
it is compiled as a 4/8/16 byte literal instead of as ordinary data. 
This confuses something in the toolchain so the final linked executable 
gets an invalid FieldNames pointer. 
Workaround: pad the FieldNames data to avoid those sizes.

rdar://19537198


Swift SVN r24587

kusl/swift,mightydeveloper/swift,Jnosh/swift,xedin/swift,CodaFi/swift,khizkhiz/swift,kperryua/swift,glessard/swift,sdulal/swift,jtbandes/swift,MukeshKumarS/Swift,bitjammer/swift,tkremenek/swift,hooman/swift,swiftix/swift,kstaring/swift,shajrawi/swift,allevato/swift,brentdax/swift,calebd/swift,allevato/swift,adrfer/swift,dduan/swift,shahmishal/swift,kstaring/swift,swiftix/swift.old,kentya6/swift,allevato/swift,gottesmm/swift,apple/swift,austinzheng/swift,harlanhaskins/swift,return/swift,cbrentharris/swift,jtbandes/swift,karwa/swift,shahmishal/swift,MukeshKumarS/Swift,djwbrown/swift,milseman/swift,hughbe/swift,stephentyrone/swift,swiftix/swift.old,johnno1962d/swift,calebd/swift,austinzheng/swift,parkera/swift,manavgabhawala/swift,CodaFi/swift,milseman/swift,djwbrown/swift,swiftix/swift,OscarSwanros/swift,zisko/swift,deyton/swift,gregomni/swift,hooman/swift,practicalswift/swift,russbishop/swift,jtbandes/swift,gmilos/swift,tkremenek/swift,sschiau/swift,danielmartin/swift,gribozavr/swift,dduan/swift,tinysun212/swift-windows,therealbnut/swift,nathawes/swift,russbishop/swift,gregomni/swift,jmgc/swift,devincoughlin/swift,felix91gr/swift,sschiau/swift,aschwaighofer/swift,modocache/swift,sschiau/swift,jmgc/swift,arvedviehweger/swift,practicalswift/swift,alblue/swift,khizkhiz/swift,kentya6/swift,Ivacker/swift,natecook1000/swift,ahoppen/swift,benlangmuir/swift,lorentey/swift,cbrentharris/swift,roambotics/swift,sschiau/swift,CodaFi/swift,gmilos/swift,shajrawi/swift,airspeedswift/swift,Ivacker/swift,aschwaighofer/swift,swiftix/swift.old,MukeshKumarS/Swift,JaSpa/swift,ken0nek/swift,jckarter/swift,arvedviehweger/swift,sschiau/swift,OscarSwanros/swift,swiftix/swift,SwiftAndroid/swift,felix91gr/swift,gribozavr/swift,allevato/swift,slavapestov/swift,jckarter/swift,shajrawi/swift,kentya6/swift,apple/swift,slavapestov/swift,devincoughlin/swift,tardieu/swift,tkremenek/swift,sschiau/swift,shajrawi/swift,roambotics/swift,adrfer/swift,shajrawi/swift,ahoppen/swift,Jnosh/swift,cbrentharris/swift,tardieu/swift,jckarter/swift,austinzheng/swift,cbrentharris/swift,slavapestov/swift,atrick/swift,amraboelela/swift,alblue/swift,hooman/swift,djwbrown/swift,devincoughlin/swift,ben-ng/swift,manavgabhawala/swift,ken0nek/swift,xedin/swift,johnno1962d/swift,djwbrown/swift,apple/swift,stephentyrone/swift,tjw/swift,KrishMunot/swift,khizkhiz/swift,arvedviehweger/swift,mightydeveloper/swift,ahoppen/swift,slavapestov/swift,milseman/swift,ben-ng/swift,slavapestov/swift,alblue/swift,OscarSwanros/swift,LeoShimonaka/swift,nathawes/swift,SwiftAndroid/swift,zisko/swift,airspeedswift/swift,parkera/swift,tkremenek/swift,stephentyrone/swift,harlanhaskins/swift,IngmarStein/swift,russbishop/swift,huonw/swift,zisko/swift,gottesmm/swift,hooman/swift,arvedviehweger/swift,LeoShimonaka/swift,karwa/swift,kusl/swift,Jnosh/swift,swiftix/swift,JaSpa/swift,tjw/swift,ahoppen/swift,rudkx/swift,codestergit/swift,milseman/swift,tinysun212/swift-windows,jtbandes/swift,parkera/swift,frootloops/swift,adrfer/swift,LeoShimonaka/swift,xwu/swift,brentdax/swift,practicalswift/swift,lorentey/swift,codestergit/swift,return/swift,parkera/swift,stephentyrone/swift,adrfer/swift,tardieu/swift,kperryua/swift,ben-ng/swift,KrishMunot/swift,emilstahl/swift,parkera/swift,tardieu/swift,johnno1962d/swift,MukeshKumarS/Swift,jckarter/swift,gribozavr/swift,benlangmuir/swift,Ivacker/swift,hooman/swift,gmilos/swift,calebd/swift,stephentyrone/swift,swiftix/swift.old,danielmartin/swift,amraboelela/swift,gregomni/swift,jopamer/swift,IngmarStein/swift,KrishMunot/swift,khizkhiz/swift,deyton/swift,swiftix/swift.old,manavgabhawala/swift,gottesmm/swift,glessard/swift,stephentyrone/swift,felix91gr/swift,LeoShimonaka/swift,huonw/swift,return/swift,LeoShimonaka/swift,uasys/swift,deyton/swift,johnno1962d/swift,zisko/swift,rudkx/swift,jopamer/swift,apple/swift,huonw/swift,manavgabhawala/swift,Jnosh/swift,huonw/swift,huonw/swift,dreamsxin/swift,bitjammer/swift,harlanhaskins/swift,huonw/swift,djwbrown/swift,JaSpa/swift,shahmishal/swift,russbishop/swift,gribozavr/swift,return/swift,johnno1962d/swift,swiftix/swift,gregomni/swift,KrishMunot/swift,apple/swift,swiftix/swift.old,felix91gr/swift,sdulal/swift,jopamer/swift,codestergit/swift,gribozavr/swift,djwbrown/swift,tjw/swift,russbishop/swift,djwbrown/swift,therealbnut/swift,atrick/swift,hughbe/swift,dreamsxin/swift,tinysun212/swift-windows,practicalswift/swift,rudkx/swift,jopamer/swift,devincoughlin/swift,JaSpa/swift,tinysun212/swift-windows,jtbandes/swift,kperryua/swift,parkera/swift,emilstahl/swift,amraboelela/swift,austinzheng/swift,rudkx/swift,karwa/swift,nathawes/swift,practicalswift/swift,jmgc/swift,khizkhiz/swift,CodaFi/swift,manavgabhawala/swift,jopamer/swift,LeoShimonaka/swift,alblue/swift,natecook1000/swift,Ivacker/swift,kperryua/swift,IngmarStein/swift,OscarSwanros/swift,ken0nek/swift,arvedviehweger/swift,milseman/swift,calebd/swift,mightydeveloper/swift,johnno1962d/swift,khizkhiz/swift,natecook1000/swift,kusl/swift,roambotics/swift,natecook1000/swift,xwu/s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