Change the IR pattern we expect for generating vabdl, vabal
Change the IR pattern we expect for generating vabdl, vabal

Now absd (i8, i8) -> u8 following by widening and possible accumulation.


Former-commit-id: be08dfdf935a2e4b2019a5bb4a51e8b6c65fca7b
darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide