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vulkan: Use larger workgroups for mul_mat_vec when M is small (#15355) * vulkan: Use larger workgroups for mul_mat_vec when M is small Also use subgroup instructions for (part of) the reduction when supported. Without this, the more expensive reductions would eat into the benefits of the larger workgroups. * update heuristic for amd/intel Co-authored-by: 0cc4m <[email protected]> --------- Co-authored-by: 0cc4m <[email protected]>