Update IRGenFunction::emitAllocEmptyBoxCall for master-next.
Update IRGenFunction::emitAllocEmptyBoxCall for master-next.

This adjust Arnold's change for SR-5148 (rdar://32618580) to work on
the master-next branch. There have been a number of changes in LLVM
related to attributes.

rudkx/swift,jopamer/swift,airspeedswift/swift,gribozavr/swift,JGiola/swift,deyton/swift,allevato/swift,zisko/swift,gribozavr/swift,lorentey/swift,airspeedswift/swift,frootloops/swift,swiftix/swift,practicalswift/swift,gribozavr/swift,karwa/swift,CodaFi/swift,alblue/swift,airspeedswift/swift,parkera/swift,jmgc/swift,shahmishal/swift,amraboelela/swift,return/swift,aschwaighofer/swift,ahoppen/swift,danielmartin/swift,stephentyrone/swift,hooman/swift,austinzheng/swift,CodaFi/swift,jopamer/swift,aschwaighofer/swift,harlanhaskins/swift,gribozavr/swift,danielmartin/swift,huonw/swift,benlangmuir/swift,glessard/swift,austinzheng/swift,stephentyrone/swift,xwu/swift,allevato/swift,practicalswift/swift,rudkx/swift,tkremenek/swift,huonw/swift,zisko/swift,parkera/swift,tjw/swift,parkera/swift,devincoughlin/swift,tkremenek/swift,tkremenek/swift,JGiola/swift,nathawes/swift,jopamer/swift,danielmartin/swift,shajrawi/swift,zisko/swift,benlangmuir/swift,allevato/swift,shahmishal/swift,apple/swift,brentdax/swift,hooman/swift,shahmishal/swift,sschiau/swift,CodaFi/swift,deyton/swift,xwu/swift,shahmishal/swift,CodaFi/swift,lorentey/swift,gribozavr/swift,uasys/swift,brentdax/swift,huonw/swift,deyton/swift,zisko/swift,parkera/swift,roambotics/swift,frootloops/swift,apple/swift,swiftix/swift,karwa/swift,roambotics/swift,nathawes/swift,karwa/swift,shajrawi/swift,gribozavr/swift,natecook1000/swift,shajrawi/swift,amraboelela/swift,nathawes/swift,atrick/swift,alblue/swift,milseman/swift,jopamer/swift,benlangmuir/swift,gregomni/swift,natecook1000/swift,danielmartin/swift,devincoughlin/swift,return/swift,harlanhaskins/swift,rudkx/swift,devincoughlin/swift,gregomni/swift,harlanhaskins/swift,practicalswift/swift,devincoughlin/swift,stephentyrone/swift,atrick/swift,huonw/swift,airspeedswift/swift,milseman/swift,allevato/swift,uasys/swift,CodaFi/swift,allevato/swift,tjw/swift,return/swift,jopamer/swift,jmgc/swift,amraboelela/swift,xwu/swift,shajrawi/swift,uasys/swift,milseman/swift,roambotics/swift,harlanhaskins/swift,frootloops/swift,roambotics/swift,sschiau/swift,frootloops/swift,sschiau/swift,return/swift,deyton/swift,xedin/swift,shahmishal/swift,swiftix/swift,rudkx/swift,jckarter/swift,tkremenek/swift,parkera/swift,xedin/swift,sschiau/swift,atrick/swift,jmgc/swift,uasys/swift,danielmartin/swift,alblue/swift,deyton/swift,shahmishal/swift,natecook1000/swift,zisko/swift,karwa/swift,practicalswift/swift,tkremenek/swift,xwu/swift,swiftix/swift,harlanhaskins/swift,JGiola/swift,xedin/swift,nathawes/swift,airspeedswift/swift,tjw/swift,aschwaighofer/swift,sschiau/swift,uasys/swift,gregomni/swift,devincoughlin/swift,xedin/swift,jckarter/swift,zisko/swift,xwu/swift,CodaFi/swift,jmgc/swift,tjw/swift,austinzheng/swift,benlangmuir/swift,devincoughlin/swift,jopamer/swift,frootloops/swift,danielmartin/swift,return/swift,lorentey/swift,milseman/swift,shajrawi/swift,harlanhaskins/swift,karwa/swift,xwu/swift,airspeedswift/swift,nathawes/swift,apple/swift,ahoppen/swift,brentdax/swift,jckarter/swift,natecook1000/swift,alblue/swift,atrick/swift,karwa/swift,atrick/swift,tjw/swift,sschiau/swift,amraboelela/swift,OscarSwanros/swift,shajrawi/swift,harlanhaskins/swift,gribozavr/swift,jckarter/swift,deyton/swift,allevato/swift,frootloops/swift,natecook1000/swift,shahmishal/swift,OscarSwanros/swift,nathawes/swift,brentdax/swift,return/swift,OscarSwanros/swift,hooman/swift,OscarSwanros/swift,devincoughlin/swift,rudkx/swift,austinzheng/swift,lorentey/swift,xedin/swift,glessard/swift,glessard/swift,amraboelela/swift,tjw/swift,jopamer/swift,stephentyrone/swift,return/swift,huonw/swift,alblue/swift,stephentyrone/swift,atrick/swift,hooman/swift,swiftix/swift,jckarter/swift,glessard/swift,roambotics/swift,jckarter/swift,ahoppen/swift,hooman/swift,brentdax/swift,gregomni/swift,amraboelela/swift,tjw/swift,milseman/swift,hooman/swift,benlangmuir/swift,JGiola/swift,airspeedswift/swift,danielmartin/swift,jmgc/swift,milseman/swift,apple/swift,natecook1000/swift,huonw/swift,xedin/swift,lorentey/swift,amraboelela/swift,stephentyrone/swift,milseman/swift,uasys/swift,shajrawi/swift,lorentey/swift,ahoppen/swift,brentdax/swift,ahoppen/swift,jmgc/swift,aschwaighofer/swift,karwa/swift,austinzheng/swift,uasys/swift,devincoughlin/swift,aschwaighofer/swift,deyton/swift,OscarSwanros/swift,glessard/swift,benlangmuir/swift,swiftix/swift,tkremenek/swift,rudkx/swift,jmgc/swift,brentdax/swift,shajrawi/swift,hooman/swift,allevato/swift,shahmishal/swift,alblue/swift,OscarSwanros/swift,huonw/swift,xedin/swift,nathawes/swift,CodaFi/swift,apple/swift,sschiau/swift,roambotics/swift,natecook1000/swift,glessard/swift,practicalswift/swift,gribozavr/swift,frootloops/swift,stephentyrone/swift,alblue/swift,OscarSwanros/swift,swiftix/swift,practicalswift/swift,practicalswift/swift,gregomni/swift,practicalswift/swift,lorentey/swift,parkera/swift,parkera/swift,sschiau/swift,parkera/swift,austinzheng/swift,aschwaighofer/swift,jckarter/swift,lorentey/swift,aschwaighofer/swift,ahoppen/swift,JGiola/swift,gregomni/sw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