[PATCH] replace atan2-inputs with more meaningful inputs

[Florian Weimer]

* Paul Zimmermann:

> Commit 934d88d used inputs with exponent generated at random in the
> whole binary64 exponent range, which yields essentially very large
> or very small values of |y/x|. Instead, this commit generates x, y at
> random in [-10,10], which should better corresponds to real applications.

Seems reasonable.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

Thanks,
Florian