Try to provide a more friendly error message when LLVM cannot be found in CMake build as suggested by @abestephensg
Try to provide a more friendly error message when LLVM cannot be found
in CMake build as suggested by @abestephensg

ronen/Halide,damienfir/Halide,kenkuang1213/Halide,kgnk/Halide,kenkuang1213/Halide,tdenniston/Halide,dougkwan/Halide,smxlong/Halide,fengzhyuan/Halide,delcypher/Halide,mcanthony/Halide,adasworks/Halide,ayanazmat/Halide,myrtleTree33/Halide,dougkwan/Halide,fengzhyuan/Halide,mcanthony/Halide,jiawen/Halide,rodrigob/Halide,lglucin/Halide,fengzhyuan/Halide,kenkuang1213/Halide,psuriana/Halide,tdenniston/Halide,damienfir/Halide,ayanazmat/Halide,jiawen/Halide,damienfir/Halide,jiawen/Halide,aam/Halide,dougkwan/Halide,adasworks/Halide,smxlong/Halide,dan-tull/Halide,myrtleTree33/Halide,aam/Halide,tdenniston/Halide,mcanthony/Halide,myrtleTree33/Halide,rodrigob/Halide,jiawen/Halide,damienfir/Halide,dougkwan/Halide,jiawen/Halide,delcypher/Halide,kenkuang1213/Halide,delcypher/Halide,dougkwan/Halide,tdenniston/Halide,kgnk/Halide,tdenniston/Halide,myrtleTree33/Halide,delcypher/Halide,kgnk/Halide,aam/Halide,ayanazmat/Halide,aam/Halide,delcypher/Halide,rodrigob/Halide,damienfir/Halide,fengzhyuan/Halide,ronen/Halide,ayanazmat/Halide,smxlong/Halide,mcanthony/Halide,psuriana/Halide,psuriana/Halide,aam/Halide,rodrigob/Halide,fengzhyuan/Halide,adasworks/Halide,damienfir/Halide,rodrigob/Halide,fengzhyuan/Halide,delcypher/Halide,tdenniston/Halide,dan-tull/Halide,kenkuang1213/Halide,kgnk/Halide,dougkwan/Halide,ronen/Halide,mcanthony/Halide,ayanazmat/Halide,delcypher/Halide,myrtleTree33/Halide,smxlong/Halide,ronen/Halide,ronen/Halide,fengzhyuan/Halide,adasworks/Halide,psuriana/Halide,tdenniston/Halide,kgnk/Halide,adasworks/Halide,smxlong/Halide,ayanazmat/Halide,dougkwan/Halide,delcypher/Halide,lglucin/Halide,dougkwan/Halide,lglucin/Halide,smxlong/Halide,kgnk/Halide,damienfir/Halide,dan-tull/Halide,ronen/Halide,myrtleTree33/Halide,rodrigob/Halide,kgnk/Halide,smxlong/Halide,adasworks/Halide,mcanthony/Halide,rodrigob/Halide,ayanazmat/Halide,rodrigob/Halide,dan-tull/Halide,mcanthony/Halide,dan-tull/Halide,aam/Halide,ayanazmat/Halide,fengzhyuan/Halide,lglucin/Halide,kenkuang1213/Halide,kenkuang1213/Halide,dan-tull/Halide,psuriana/Halide,smxlong/Halide,jiawen/Halide,ronen/Halide,lglucin/Halide,mcanthony/Halide,adasworks/Halide,dan-tull/Halide,myrtleTree33/Halide,myrtleTree33/Halide,psuriana/Halide,adasworks/Halide,kenkuang1213/Halide,damienfir/Halide,tdenniston/Halide,ronen/Halide,jiawen/Halide,aam/Halide,kgnk/Halide,lglucin/Halide,lglucin/Halide,dan-tull/Halide,psuriana/Halide