[eigen] Regarding bug #156

[Hauke Heibel <hauke.heibel@xxxxxxxxxxxxxx>]

I have a fix attached. I tried it on geo_hyperplane1 and it works out
of the box but I am not willing to run "all" tests on my machine an
block it for hours. Sorry. :)

Let's hope somebody will come soon and sponsor a little and powerful
testing farm!

Now regarding the bug ...

We cannot use nested<T>::type as arguments on functions and right now
internal::as_argument is doing exactly that. The attached patch should
fix the issue. I am not 100% sure but I think that with my as_agrument
implementations the specializations for Matrix and Array are not
needed anymore.

Any idea or comments?

- Hauke

Bug Info: http://eigen.tuxfamily.org/bz/show_bug.cgi?id=156

Attachment: alignment_fix.patch
Description: Binary data