bug#7098: Emacs24 crash with segmentation fault

[Eli Zaretskii]

> From: Thierry Volpiatto <thierry.volpiatto@gmail.com>
> Cc: 7098@debbugs.gnu.org
> Date: Sat, 25 Sep 2010 09:40:55 +0200
> 
> I will try to go down in the trunk to find a working version.

Thanks.  Crashes in GC are hard to track down (etc/DEBUG has some
guidance, but it needs some proficiency to actually follow through).
Knowing which commit caused the problem makes it much easier to find
the culprit.