Remove executable stacks (HiPE/amd64)

Hi,
the attached patch fixes executable stacks in HiPE asm code for amd64.
I guess a similar patch can easily be applied to the other
architectures.

References:
[1] https://bugs.gentoo.org/show_bug.cgi?id=249328
[2] http://www.erlang.org/pipermail/erlang-bugs/2008-December/001125.html
[3] http://www.gentoo.org/proj/en/hardened/gnu-stack.xml

Regards,
Davide Pesavento


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