Gemm a8w8 bench

[shengnxu]

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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 6 committers have signed the CLA.

✅ valarLip
❌ Marvin Tsai
❌ jiaryang
❌ felixamd
❌ carlushuang
❌ shengnxu

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