Sema: Clean up the RequirementEnvironment's SubstitutionMap construction
Sema: Clean up the RequirementEnvironment's SubstitutionMap construction

Instead of calling addSubstitution() and addConformance(), use
GenericSignature::getSubstitutionMap().

benlangmuir/swift,milseman/swift,return/swift,djwbrown/swift,benlangmuir/swift,hughbe/swift,calebd/swift,xedin/swift,austinzheng/swift,roambotics/swift,return/swift,uasys/swift,sschiau/swift,karwa/swift,felix91gr/swift,CodaFi/swift,djwbrown/swift,ahoppen/swift,amraboelela/swift,alblue/swift,shahmishal/swift,natecook1000/swift,swiftix/swift,harlanhaskins/swift,manavgabhawala/swift,felix91gr/swift,zisko/swift,shajrawi/swift,bitjammer/swift,atrick/swift,austinzheng/swift,jopamer/swift,devincoughlin/swift,jtbandes/swift,devincoughlin/swift,milseman/swift,xwu/swift,codestergit/swift,airspeedswift/swift,OscarSwanros/swift,allevato/swift,jmgc/swift,devincoughlin/swift,arvedviehweger/swift,alblue/swift,CodaFi/swift,nathawes/swift,airspeedswift/swift,bitjammer/swift,manavgabhawala/swift,bitjammer/swift,milseman/swift,danielmartin/swift,jopamer/swift,tardieu/swift,jckarter/swift,harlanhaskins/swift,aschwaighofer/swift,atrick/swift,xedin/swift,zisko/swift,xedin/swift,gregomni/swift,shahmishal/swift,codestergit/swift,amraboelela/swift,swiftix/swift,devincoughlin/swift,uasys/swift,jckarter/swift,xwu/swift,apple/swift,tkremenek/swift,zisko/swift,jckarter/swift,manavgabhawala/swift,rudkx/swift,hooman/swift,jtbandes/swift,zisko/swift,shajrawi/swift,karwa/swift,ahoppen/swift,gregomni/swift,xedin/swift,sschiau/swift,apple/swift,xwu/swift,CodaFi/swift,frootloops/swift,tardieu/swift,tkremenek/swift,felix91gr/swift,roambotics/swift,swiftix/swift,jopamer/swift,OscarSwanros/swift,ahoppen/swift,tjw/swift,tkremenek/swift,stephentyrone/swift,harlanhaskins/swift,swiftix/swift,djwbrown/swift,swiftix/swift,natecook1000/swift,ahoppen/swift,CodaFi/swift,manavgabhawala/swift,shajrawi/swift,brentdax/swift,JGiola/swift,nathawes/swift,arvedviehweger/swift,gribozavr/swift,djwbrown/swift,jopamer/swift,gribozavr/swift,rudkx/swift,gregomni/swift,xedin/swift,calebd/swift,gribozavr/swift,tjw/swift,aschwaighofer/swift,karwa/swift,djwbrown/swift,shahmishal/swift,nathawes/swift,felix91gr/swift,gregomni/swift,tjw/swift,tardieu/swift,gribozavr/swift,swiftix/swift,roambotics/swift,xedin/swift,tkremenek/swift,lorentey/swift,return/swift,shajrawi/swift,JGiola/swift,atrick/swift,frootloops/swift,tjw/swift,aschwaighofer/swift,codestergit/swift,manavgabhawala/swift,uasys/swift,CodaFi/swift,arvedviehweger/swift,tardieu/swift,codestergit/swift,swiftix/swift,allevato/swift,tinysun212/swift-windows,Jnosh/swift,stephentyrone/swift,glessard/swift,milseman/swift,JGiola/swift,codestergit/swift,huonw/swift,jmgc/swift,frootloops/swift,shajrawi/swift,gribozavr/swift,jtbandes/swift,aschwaighofer/swift,frootloops/swift,glessard/swift,sschiau/swift,tinysun212/swift-windows,tkremenek/swift,return/swift,OscarSwanros/swift,apple/swift,tardieu/swift,danielmartin/swift,sschiau/swift,deyton/swift,benlangmuir/swift,gribozavr/swift,airspeedswift/swift,JGiola/swift,shahmishal/swift,OscarSwanros/swift,tinysun212/swift-windows,jtbandes/swift,calebd/swift,allevato/swift,deyton/swift,bitjammer/swift,deyton/swift,lorentey/swift,practicalswift/swift,jopamer/swift,milseman/swift,nathawes/swift,jtbandes/swift,devincoughlin/swift,practicalswift/swift,atrick/swift,devincoughlin/swift,shajrawi/swift,karwa/swift,arvedviehweger/swift,JGiola/swift,felix91gr/swift,aschwaighofer/swift,uasys/swift,parkera/swift,jckarter/swift,lorentey/swift,jckarter/swift,bitjammer/swift,Jnosh/swift,hughbe/swift,hooman/swift,felix91gr/swift,bitjammer/swift,amraboelela/swift,return/swift,jopamer/swift,codestergit/swift,jtbandes/swift,harlanhaskins/swift,zisko/swift,huonw/swift,sschiau/swift,nathawes/swift,harlanhaskins/swift,djwbrown/swift,deyton/swift,hooman/swift,Jnosh/swift,huonw/swift,brentdax/swift,apple/swift,tjw/swift,alblue/swift,hughbe/swift,brentdax/swift,tkremenek/swift,hughbe/swift,OscarSwanros/swift,danielmartin/swift,karwa/swift,huonw/swift,hughbe/swift,roambotics/swift,devincoughlin/swift,practicalswift/swift,practicalswift/swift,austinzheng/swift,CodaFi/swift,jckarter/swift,sschiau/swift,calebd/swift,natecook1000/swift,hughbe/swift,benlangmuir/swift,zisko/swift,frootloops/swift,austinzheng/swift,rudkx/swift,glessard/swift,manavgabhawala/swift,tjw/swift,hooman/swift,jtbandes/swift,airspeedswift/swift,frootloops/swift,austinzheng/swift,shahmishal/swift,glessard/swift,arvedviehweger/swift,deyton/swift,jmgc/swift,karwa/swift,practicalswift/swift,harlanhaskins/swift,amraboelela/swift,parkera/swift,brentdax/swift,codestergit/swift,lorentey/swift,amraboelela/swift,huonw/swift,shahmishal/swift,natecook1000/swift,karwa/swift,hooman/swift,nathawes/swift,xwu/swift,jmgc/swift,jmgc/swift,felix91gr/swift,hooman/swift,practicalswift/swift,apple/swift,tinysun212/swift-windows,gribozavr/swift,calebd/swift,xedin/swift,ahoppen/swift,atrick/swift,danielmartin/swift,natecook1000/swift,rudkx/swift,calebd/swift,parkera/swift,alblue/swift,nathawes/swift,huonw/swift,jmgc/swift,austinzheng/swift,lorentey/swift,gregomni/swift,practicalswift/swift,CodaFi/swift,shajrawi/swift,lorentey/swift,stephentyrone/swift,sschiau/swift,tardieu/swift,uasys/swift,tkremenek/swift,amraboelela/swift,allevato/swift,tinysun212/swift-windows,roambotics/swift,aschwaighofer/swift,danielmartin/swift,xwu/swift,brentdax/swift,bitjammer/swift,uasys/swift,alblue/swift,tjw/swift,rudkx/swift,calebd/swift,allevato/swift,deyton/swift,glessard/swift,benlangmuir/swift,gregomni/swift,danielmartin/swift,JGiola/swift,gribozavr/swift,jckarter/swift,allevato/swift,practicalswift/swift,milseman/swift,airspeedswift/swift,stephentyrone/swift,devincoughlin/swift,shahmishal/swift,jopamer/swift,brentdax/swift,amraboelela/swift,arvedviehweger/swift,Jnosh/swift,harlanhaskins/swift,frootloops/swift,roambotics/swift,arvedviehweger/swift,OscarSwanros/swift,brentdax/swift,tardieu/swift,tinysun212/swift-windows,xedin/swift,shahmishal/swift,alblue/swift,return/swift,danielmartin/swift,hughbe/swift,airspeedswift/swift,Jnosh/swift,atrick/swift,xwu/swift,tinysun212/swift-windows,allevato/swift,stephentyrone/swift,uasys/swift,shajrawi/swift,parkera/swift,aschwaighofer/swift,milseman/swift,parkera/swift,sschiau/swift,OscarSwanros/swift,Jnosh/swift,return/swift,jmgc/swift,djwbrown/swift,parkera/swift,Jnosh/swift,natecook1000/swift,stephentyrone/swift,deyton/swift,glessard/swift,alblue/swift,airspeedswift/swift,lorentey/swift,ahoppen/swift,hooman/swift,benlangmuir/swift,huonw/swift,parkera/swift,xwu/swift,parkera/swift,apple/swift,natecook1000/swift,zisko/swift,lorentey/swift,rudkx/swift,karwa/swift,manavgabhawala/swift,austinzheng/swift,stephentyrone/swift