Reinstate the use of enable_if within SIL's UnaryInstructionBase using class templates rather than constexpr.
Reinstate the use of enable_if within SIL's UnaryInstructionBase using class templates rather than constexpr.


Swift SVN r4903

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