SIL: KeyPathInst has to have side effects, since it retains.
SIL: KeyPathInst has to have side effects, since it retains.

Fixes rdar://problem/31975279.

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