Clean up count_if/none in STLExtras.
Clean up count_if/none in STLExtras.

Specifically this change:

1. Changed the input collection to be a const T & instead of T.
2. The return type of count_if is now properly the difference_type of the input range's iterators.

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