In the current version xserver-xorg-core 2:1.7.6-2ubuntu7 Option NoTrapSignals 
works correctly.
I use Kubuntu and I have created a file /usr/lib/X11/xorg.conf.d/01-server.conf 
to give the option (but there are of course many other possible places)

In /var/log/Xorg.0.log you can see the difference when the server
crashes. By default there is a backtrace, with the NoTrapSignals there
is none.

Also in gdb you can see the difference. After a SEGV you can continue
without the option (the handlers will be run and then Xorg will exit).
With NoTrapSignal you cannot continue after a SEGV, the process has
already been terminated.

-- 
[Lucid] Option NoTrapSignals ignored when debugging xserver
https://bugs.launchpad.net/bugs/532845
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