Optimize FP8 gemm for prefill#84
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before: ``` gemm_bf16(native): 4.772 ms, gemm_fp8(opt): 0.000 ms, gemm_int8(opt): 0.000 ms, gemm_bf16(opt): 15.328 ms ``` after: ``` gemm_bf16(native): 4.847 ms, gemm_fp8(opt): 0.000 ms, gemm_int8(opt): 0.000 ms, gemm_bf16(opt): 3.927 ms ```
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