metal : refactor mat-vec code (#12569)
* metal : refactor mat-vec code ggml-ci * metal : rename all_sum -> sum_all ggml-ci * metal : fix comments [no ci] * metal : fix nr constant [no ci] * metal : mv q6_K support nr0 > 1 ggml-ci * metal : reduce register pressure ggml-ci * metal : fix typo [no ci] * metal : reduce register pressure ggml-ci
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