Remove some dead math intrinsics
Remove some dead math intrinsics

ronen/Halide,adasworks/Halide,dougkwan/Halide,psuriana/Halide,jiawen/Halide,tdenniston/Halide,ronen/Halide,kgnk/Halide,jiawen/Halide,jiawen/Halide,tdenniston/Halide,ronen/Halide,ronen/Halide,jiawen/Halide,adasworks/Halide,tdenniston/Halide,ronen/Halide,ronen/Halide,psuriana/Halide,ronen/Halide,kgnk/Halide,adasworks/Halide,jiawen/Halide,dougkwan/Halide,kgnk/Halide,ronen/Halide,kgnk/Halide,tdenniston/Halide,dougkwan/Halide,psuriana/Halide,tdenniston/Halide,psuriana/Halide,kgnk/Halide,adasworks/Halide,kgnk/Halide,adasworks/Halide,tdenniston/Halide,psuriana/Halide,dougkwan/Halide,psuriana/Halide,tdenniston/Halide,dougkwan/Halide,psuriana/Halide,tdenniston/Halide,jiawen/Halide,adasworks/Halide,dougkwan/Halide,jiawen/Halide,adasworks/Halide,dougkwan/Halide,adasworks/Halide,kgnk/Halide,dougkwan/Halide,kgnk/Halide