check isa for UT, use OMP as default

[ThanatosShinji]

Type of Change

1. set OMP on for bestla.
2. Check AVX512F flag for LayerNormalization.

Perf on Ultra7-155H, Mistral-7B int4, group=-1, compute_dtype=int8

 Once we have made our plans,
 We can’t follow them.


model_print_timings:        load time =   100.93 ms
model_print_timings:      sample time =     8.00 ms /    16 runs   (    0.50 ms per token)
model_print_timings: prompt eval time =   100.82 ms /     2 tokens (   50.41 ms per token)
model_print_timings:        eval time =  1239.00 ms /    15 runs   (   82.60 ms per token)
model_print_timings:       total time =  1355.56 ms
========== eval time log of each prediction ==========
prediction   0, time: 100.82ms
prediction   1, time: 79.96ms
prediction   2, time: 81.61ms
prediction   3, time: 80.69ms
prediction   4, time: 81.98ms
prediction   5, time: 82.39ms