Added test that uses a constant generated Func (should map to constant memory in GPU targets).
Added test that uses a constant generated Func (should map to constant memory in GPU targets).

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