Changed linear solver to use expr_uses_vars function rather than a custom version of the same. Minor style tweaks as well.
Changed linear solver to use expr_uses_vars function rather than a custom version of the same. Minor style tweaks as well.

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