Reenable SIMT loop guards in Ptx_dev
Reenable SIMT loop guards in Ptx_dev

(They were disabled in the previous commit from an old bug chase.)
damienfir/Halide,adasworks/Halide,psuriana/Halide,gchauras/Halide,mcanthony/Halide,fengzhyuan/Halide,tdenniston/Halide,fengzhyuan/Halide,damienfir/Halide,kenkuang1213/Halide,kenkuang1213/Halide,psuriana/Halide,adasworks/Halide,delcypher/Halide,ayanazmat/Halide,adasworks/Halide,fengzhyuan/Halide,myrtleTree33/Halide,dan-tull/Halide,dougkwan/Halide,kgnk/Halide,kgnk/Halide,smxlong/Halide,ayanazmat/Halide,kenkuang1213/Halide,lglucin/Halide,ronen/Halide,mikeseven/Halide,aam/Halide,jiawen/Halide,tdenniston/Halide,ronen/Halide,aam/Halide,rodrigob/Halide,jiawen/Halide,dan-tull/Halide,mikeseven/Halide,rodrigob/Halide,ronen/Halide,ayanazmat/Halide,smxlong/Halide,gchauras/Halide,delcypher/Halide,dougkwan/Halide,mcanthony/Halide,mikeseven/Halide,dougkwan/Halide,rodrigob/Halide,smxlong/Halide,delcypher/Halide,ayanazmat/Halide,myrtleTree33/Halide,mcanthony/Halide,aam/Halide,damienfir/Halide,gchauras/Halide,dan-tull/Halide,myrtleTree33/Halide,rodrigob/Halide,mcanthony/Halide,damienfir/Halide,kenkuang1213/Halide,dougkwan/Halide,jiawen/Halide,dougkwan/Halide,fengzhyuan/Halide,mikeseven/Halide,jiawen/Halide,ronen/Halide,myrtleTree33/Halide,kenkuang1213/Halide,gchauras/Halide,damienfir/Halide,ronen/Halide,lglucin/Halide,mikeseven/Halide,damienfir/Halide,dan-tull/Halide,jiawen/Halide,adasworks/Halide,tdenniston/Halide,psuriana/Halide,ronen/Halide,dan-tull/Halide,lglucin/Halide,dougkwan/Halide,myrtleTree33/Halide,jiawen/Halide,dan-tull/Halide,mcanthony/Halide,fengzhyuan/Halide,damienfir/Halide,aam/Halide,ayanazmat/Halide,damienfir/Halide,mcanthony/Halide,myrtleTree33/Halide,kenkuang1213/Halide,kenkuang1213/Halide,rodrigob/Halide,psuriana/Halide,adasworks/Halide,myrtleTree33/Halide,kgnk/Halide,psuriana/Halide,tdenniston/Halide,lglucin/Halide,dan-tull/Halide,fengzhyuan/Halide,delcypher/Halide,dougkwan/Halide,adasworks/Halide,kgnk/Halide,fengzhyuan/Halide,kgnk/Halide,delcypher/Halide,ayanazmat/Halide,lglucin/Halide,aam/Halide,myrtleTree33/Halide,adasworks/Halide,mcanthony/Halide,gchauras/Halide,kgnk/Halide,smxlong/Halide,tdenniston/Halide,kgnk/Halide,rodrigob/Halide,rodrigob/Halide,kgnk/Halide,tdenniston/Halide,dougkwan/Halide,smxlong/Halide,smxlong/Halide,delcypher/Halide,mcanthony/Halide,smxlong/Halide,tdenniston/Halide,dan-tull/Halide,ayanazmat/Halide,aam/Halide,kenkuang1213/Halide,lglucin/Halide,ayanazmat/Halide,ronen/Halide,smxlong/Halide,tdenniston/Halide,rodrigob/Halide,fengzhyuan/Halide,adasworks/Halide,lglucin/Halide,ronen/Halide,delcypher/Halide,aam/Halide,psuriana/Halide,jiawen/Halide,delcypher/Halide,psuriana/Halide,gchauras/Halide