Bug#845690: gcc-6: gcc creates unbootable kernel on x86-64

[Damien Wyart <damien.wyart@gmail.com>]

After running further tests today, I think this is in fact *not*
related to gcc but to the kernel itself.

I tested all 6.2.1-X versions as well as gcc-5 (5.4.1-3) and all the
kernels fail to boot (balck screen just after grub and nothing in the
logs).

A few days ago (beginning of this week, I was able to compile the
4.9-rc6+ kernel fine (with gcc-6 6.2.1-4) so something must have
changed in the kernel itself (or elsewhere on the system?). I am not
able to bisect now, but at least this seems to clear gcc from being
the main culprit.

Best regards

Damien