Ensure all bound ImageParams have non-NULL host/dev pointers
Ensure all bound ImageParams have non-NULL host/dev pointers

This adds a layer of paranoia to catch failed allocations of Buffers.

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