[build-script] Support --lldb-test-swift-only=0
[build-script] Support --lldb-test-swift-only=0

Make it possible to run the full lldb test suite through build-script
again.

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