bool OutputImageParam::defined() => bool OutputImageParam::defined() const
bool OutputImageParam::defined() => bool OutputImageParam::defined() const

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