* Slightly faster AVX2 implementation for q4_k_r4
* Even better AVX2 implementation for q4_k_r4
We now arrive at PP-512 = 328 t/s for LLaMA-3.1-8B on a
Ryzen-5975WX CPU, up from 291 t/s when I last measured
on 3c5f8722.
With FA and Q8_0 K-cache we get to 339.5 t/s.
* Fix llama-bench labels that I broke with #181
* Faster AVX2 implementation for q5_k_q4
We arrive at 302 t/s for LLaMA-3.1-8B on a Ryzen-5975WX CPU,
up from 273 t/s.
* Use AVX2 implementation of q4_k_r4 and q5_k_r4 also on Zen4
After the changes I made to AVX2, it ends up being slightly faster
compared to what I had for Zen4.
* Minor tweak
* Cleanup
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Co-authored-by: Iwan Kawrakow <iwan.kawrakow@gmail.com>
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