Don't convert size-1 GPU for loops to if statements.
Don't convert size-1 GPU for loops to if statements.

E.g. the loop over thread indices

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