Added AVX512F macros to ggml.c

[amiralimi]

Hi.
I added AVX512F macros to ggml.c. For commiting I ran pre-commit too. I wanted to add AVX512_FP16 support too, but I didn't have a hardware that supports it.

This change showed speed-up when running F16 and F32 models. Here are the results:

Results

avx512 - fp16
llama_print_timings:        50 runs   (  453.77 ms per token,     2.20 tokens per second)

avx - fp16
llama_print_timings:        50 runs   (  625.48 ms per token,     1.60 tokens per second)

avx512 - fp32
llama_print_timings:        50 runs   (  517.39 ms per token,     1.93 tokens per second)

avx - fp32
llama_print_timings:        50 runs   (  638.76 ms per token,     1.57 tokens per second)

I don't know if I need to add more things for this change (I'm new to open-source development).

[ggerganov]

Nice 👍