[stdlib] added safe unchecked comment
[stdlib] added safe unchecked comment

Swift SVN r23862

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