When optimizing release(o1), allow scanning past a release(o2) since it cannot affect the lifetime of o1 in a way we care about.  This allows eliminating 5 more retain/release pairs from the stdlib, including from String(Int128, radix)->String,  String(Double)->String, and the slice reduce methods.
When optimizing release(o1), allow scanning past a release(o2) since it
cannot affect the lifetime of o1 in a way we care about.  This allows
eliminating 5 more retain/release pairs from the stdlib, including
from String(Int128, radix)->String,  String(Double)->String,
and the slice reduce methods.


Swift SVN r2036

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