Provide muloti4 on all archs, not just arm64.
Provide muloti4 on all archs, not just arm64.

Although this builtin is provided by clang rt builtins,
it isn't provided by libgcc, which is the default
runtime library on Linux, even when compiling with clang.
This implementation is copied here to avoid a new dependency
on compiler-rt on Linux.

Open up the ifdef to include non-Apple (i.e. Linux) builds.

rdar://problem/22616842

Swift SVN r31848

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