Added math function definitions to OpenCL C codegen
Added math function definitions to OpenCL C codegen

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