Fix misuse of alignof, which returns alignment as 2^N instead of N.
Fix misuse of alignof, which returns alignment as 2^N instead of N.

If we constexpr'd some of the functions in MathExtras we could use
log2(alignof(T)), but for now just hardcode a literal "3".

Swift SVN r9928

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