Be more careful with TF handling to fix some copy protection codes in wine

patch originally for i386 by Linus, then ported to x86_64 by Andi Kleen
see: [PATCH] x86_64: Some fixes for single step handling
commit: be61bff7

But it was never applied to the ia32 emulation code which breaks some
copy-protection schemes under wine when running on x86_64.
Signed-off-by: NPeter Beutner <p.beutner@gmx.net>
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>