[PATCH] benchtests: Add sinf traces

[Paul Zimmermann]

       Dear Wilco,

> Note there is little difference between the box2d traces for sinf. And while the
> speedup for box2d is 10% higher than the random input, they are not far off,
> so the random case shows the same issue.
> 
>              sinf       cosf
>      random  45.4%      45.2%
>       large  68.0%      53.4%
>        huge  19.4%      9.8%
> box2d-small  58.2%      100.2%
>  box2d-hard  56.7%       72.7%
> box2d-mixed  52.5%      54.4%

I did try to reproduce these figures on a Intel(R) Xeon(R) Silver 4214
with gcc 15.2.0. Here is what "make bench" gives for the reciprocal-throughput
of sinf with your "box2d" traces, both with glibc master and with the sinf
patch contributed by Adhemerval. I prefer to give timings in cycles because
these are very small numbers:

              master   sinf patch
box2d-small   8.2      10.4 (+27%)
box2d-hard    9.9      12.6 (+27%)
box2d-mixed   9.6      11.3 (+18%)

We can see that "sinf patch" is slower by less than 3 cycles in all cases.

Paul