Use std::nt_element in median3x3
Use std::nt_element in median3x3


Former-commit-id: be3f2bb4e15122810efd90b56000def61cc0b29f
darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide