Fix output buffer constraints so they can accomodate planar images
Fix output buffer constraints so they can accomodate planar images


Former-commit-id: ced4d91e858aea5be13c28f9e5130d7543824031
Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide