Fix in pointer discipline per comment from Andrew.
Fix in pointer discipline per comment from Andrew.

(This is a correctness fix for older llvm versions.)

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