[RFC/i385newframe] Fix sigtramp unwinder.

[Michal Ludvig]

Hi,
this patch fixes x86_64_linux_sigcontext_addr() which returned wrong 
address, and consequently enables unwinding from signal handlers.
Detailed explanation of this change is in the comment in the patch.
OK to apply?

Michal Ludvig
-- 
* SuSE CR, s.r.o     * mludvig@suse.cz
* (+420) 296.545.373 * http://www.suse.cz
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