[sil-combine] Strip off RC identity preserving ops from retain value and release value.
[sil-combine] Strip off RC identity preserving ops from retain value and release value.

This is always good to do since it makes it clearer what the ARC optimizer is
doing. I have not decided how I want to strip off arguments from strong_retain,
strong_release since I may necessarily convert the strong_{retain,release} back
to a {retain,release}_value.

Swift SVN r21480

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