add more simplification rules for min/max clamp with exprs
add more simplification rules for min/max clamp with exprs


Former-commit-id: b3513664a95f6592e8ee9f9f147da39490ae58dd
Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide