ggml: optimize ggml_vec_dot_mxfp4_q8_0 dot product on ARM SVE#19171

jiangshhh wants to merge 1 commit intoggml-org:masterggml-org/llama.cpp:masterfrom

jiangshhh:sve-ggml_vec_dot_mxfp4_q8_0-optjiangshhh/llama.cpp:sve-ggml_vec_dot_mxfp4_q8_0-optCopy head branch name to clipboard