[lit] Add a new feature DARWIN_SIMULATOR so we can use requires lines based off the simulator.
[lit] Add a new feature DARWIN_SIMULATOR so we can use requires lines based off the simulator.

Seems useful. I was surprised not to find it when fixing apple/swift#18293.

allevato/swift,karwa/swift,xedin/swift,stephentyrone/swift,ahoppen/swift,nathawes/swift,sschiau/swift,alblue/swift,shajrawi/swift,apple/swift,lorentey/swift,shahmishal/swift,airspeedswift/swift,gregomni/swift,jmgc/swift,xedin/swift,CodaFi/swift,gribozavr/swift,practicalswift/swift,jmgc/swift,rudkx/swift,atrick/swift,hooman/swift,airspeedswift/swift,natecook1000/swift,nathawes/swift,tkremenek/swift,parkera/swift,alblue/swift,alblue/swift,tkremenek/swift,roambotics/swift,nathawes/swift,gribozavr/swift,stephentyrone/swift,benlangmuir/swift,parkera/swift,apple/swift,natecook1000/swift,gribozavr/swift,sschiau/swift,brentdax/swift,glessard/swift,allevato/swift,karwa/swift,alblue/swift,gregomni/swift,shahmishal/swift,austinzheng/swift,jopamer/swift,gregomni/swift,danielmartin/swift,xedin/swift,ahoppen/swift,jckarter/swift,JGiola/swift,parkera/swift,ahoppen/swift,jopamer/swift,CodaFi/swift,benlangmuir/swift,jckarter/swift,jmgc/swift,amraboelela/swift,shajrawi/swift,lorentey/swift,brentdax/swift,xwu/swift,austinzheng/swift,alblue/swift,allevato/swift,JGiola/swift,shajrawi/swift,harlanhaskins/swift,gregomni/swift,sschiau/swift,xedin/swift,benlangmuir/swift,tkremenek/swift,amraboelela/swift,aschwaighofer/swift,airspeedswift/swift,danielmartin/swift,harlanhaskins/swift,brentdax/swift,brentdax/swift,tkremenek/swift,practicalswift/swift,xedin/swift,rudkx/swift,harlanhaskins/swift,amraboelela/swift,xedin/swift,xedin/swift,tkremenek/swift,airspeedswift/swift,harlanhaskins/swift,JGiola/swift,tkremenek/swift,nathawes/swift,karwa/swift,sschiau/swift,jckarter/swift,practicalswift/swift,aschwaighofer/swift,ahoppen/swift,CodaFi/swift,apple/swift,practicalswift/swift,airspeedswift/swift,atrick/swift,parkera/swift,lorentey/swift,aschwaighofer/swift,devincoughlin/swift,natecook1000/swift,amraboelela/swift,harlanhaskins/swift,glessard/swift,devincoughlin/swift,atrick/swift,jopamer/swift,gregomni/swift,stephentyrone/swift,benlangmuir/swift,shahmishal/swift,hooman/swift,jopamer/swift,glessard/swift,benlangmuir/swift,airspeedswift/swift,lorentey/swift,jmgc/swift,shahmishal/swift,gribozavr/swift,xwu/swift,atrick/swift,xwu/swift,glessard/swift,danielmartin/swift,natecook1000/swift,apple/swift,sschiau/swift,xwu/swift,CodaFi/swift,stephentyrone/swift,austinzheng/swift,practicalswift/swift,rudkx/swift,karwa/swift,practicalswift/swift,alblue/swift,rudkx/swift,natecook1000/swift,austinzheng/swift,shajrawi/swift,alblue/swift,harlanhaskins/swift,amraboelela/swift,harlanhaskins/swift,jmgc/swift,gregomni/swift,lorentey/swift,danielmartin/swift,nathawes/swift,nathawes/swift,jopamer/swift,devincoughlin/swift,JGiola/swift,atrick/swift,roambotics/swift,shahmishal/swift,jckarter/swift,gribozavr/swift,allevato/swift,devincoughlin/swift,parkera/swift,airspeedswift/swift,CodaFi/swift,jckarter/swift,karwa/swift,shahmishal/swift,glessard/swift,aschwaighofer/swift,roambotics/swift,ahoppen/swift,austinzheng/swift,xwu/swift,lorentey/swift,rudkx/swift,parkera/swift,natecook1000/swift,shahmishal/swift,CodaFi/swift,jopamer/swift,hooman/swift,danielmartin/swift,amraboelela/swift,brentdax/swift,devincoughlin/swift,austinzheng/swift,hooman/swift,devincoughlin/swift,atrick/swift,karwa/swift,austinzheng/swift,parkera/swift,ahoppen/swift,tkremenek/swift,lorentey/swift,practicalswift/swift,devincoughlin/swift,jckarter/swift,glessard/swift,aschwaighofer/swift,stephentyrone/swift,benlangmuir/swift,hooman/swift,allevato/swift,stephentyrone/swift,stephentyrone/swift,allevato/swift,shajrawi/swift,danielmartin/swift,nathawes/swift,shajrawi/swift,apple/swift,hooman/swift,allevato/swift,gribozavr/swift,parkera/swift,roambotics/swift,roambotics/swift,JGiola/swift,xedin/swift,hooman/swift,karwa/swift,CodaFi/swift,apple/swift,xwu/swift,shajrawi/swift,karwa/swift,gribozavr/swift,shajrawi/swift,aschwaighofer/swift,practicalswift/swift,brentdax/swift,aschwaighofer/swift,jckarter/swift,sschiau/swift,amraboelela/swift,lorentey/swift,shahmishal/swift,rudkx/swift,natecook1000/swift,JGiola/swift,jmgc/swift,jopamer/swift,brentdax/swift,xwu/swift,gribozavr/swift,devincoughlin/swift,jmgc/swift,sschiau/swift,danielmartin/swift,roambotics/swift,sschiau/swift