[Precise][CVE-2014-9090] x86_64, traps: Stop using IST for #SS

[Ben Hutchings]

I think you want these too:

af726f21ed8a x86_64, traps: Fix the espfix64 #DF fixup and rewrite it in C
b645af2d5905 x86_64, traps: Rework bad_iret

I'm attaching backports to 3.2.

Ben.

-- 
Ben Hutchings
Experience is directly proportional to the value of equipment destroyed.
                                                         - Carolyn Scheppner
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