Add Llama xnnpack recipe

[jackzhxng]

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[pytorch-bot]

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[digantdesai]

does this work OK, i.e. produce correct output?

[jackzhxng]

I haven't tried recently but I've definitely used this combination of parameters a few months ago when I was working on export_llm and it worked

[jackzhxng]

(aka these are some of the most common options)

[digantdesai]

Let me run it..

[digantdesai]

Seems to produce sane output. Let's land. CI?

[jackzhxng]

Should already be covered in one of our many Llama CI tests! This combination params is pretty standard