[stdlib] bisect replacement of bitcasts 0..<3 of 6
[stdlib] bisect replacement of bitcasts 0..<3 of 6

Applying half of an earlier change, trying to zero in on a bot-only
failure.

Swift SVN r22836

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