Handle case where true_value == false_value
Handle case where true_value == false_value

It's unlikely to occur because presumably the expressions have been
simplified, but you never know.

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