[cmake] Use the new LLVM_BUILD_TYPE variable provided by LLVMConfig.cmake in order to find the clang headers when compiling with Xcode.
[cmake] Use the new LLVM_BUILD_TYPE variable provided by LLVMConfig.cmake in order to find the clang headers when compiling with Xcode.

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