Move specialize clamped ramps after vector deinterleave
Move specialize clamped ramps after vector deinterleave

interleaving now sometimes opens up clamped ramp opportunities


Former-commit-id: ffae8ffbc0a9cff73c2d412e41bc2084b5929657
darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide