Stop building llvm with modules enabled.
Stop building llvm with modules enabled.

This was enabled in September (208e82f), and although it works most of the
time, we are running into some problems that depend on the specific version
of Clang. We should hold off using modules until they are more robust.
rdar://problem/29627138

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