i386: save/restore eflags in context switch (CVE-2006-5173)

(And reset it on new thread creation)

It turns out that eflags is important to save and restore not just
because of iopl, but due to the magic bits like the NT bit, which we
don't want leaking between different threads.

Backported to 2.6.16 by Chuck Ebbert <76306.1226@compuserve.com>
[Backport consisted of removing the CFI annotations.]

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Adrian Bunk <bunk@stusta.de>