Add new simplification rule to pull constants out of clamps
Add new simplification rule to pull constants out of clamps

Tested with the fuzz tester


Former-commit-id: 14b5716c3addc3dd1b3a582e45afe4b00358f68f
darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide