von Mises distribution improvement

[Paolo Carlini]

On 03/04/2013 05:56 AM, Ulrich Drepper wrote:
> I'd like to check in this patch which would improve the performance of
> the distribution quite a bit by pulling constant computations into the
> constructor.  This patch will change the memory layout which can be
> done easily only now.  It also fixes one small bug in operator== and
> in a comment.
>
> OK?
Sure.

Paolo.