Added global OpenCL context storage/cleanup for jitted functions
Added global OpenCL context storage/cleanup for jitted functions

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