metal : more precise Q*K in FA vec kernel #10247
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cont #10171, #10232
Use F32 for the dot products in the FA vec kernel to improve the precision further. The performance is the same.
./llama-cli -m ./models/qwen2.5-7b-coder/ggml-model-f16.gguf -p "I believe the meaning of life is to" -n 128 -s 1 -fa