Fix bug where module identifier sometimes collides with runtime function
Fix bug where module identifier sometimes collides with runtime function

It popped up when someone made a func called "error", and the module
was named "halide_error", which collided with the runtime function of
the same name.

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