Verify that ForceValueExprs preserve lvalue-ness.
Verify that ForceValueExprs preserve lvalue-ness.

Swift SVN r20139

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