The kernel patch titled

	c/r: prctl: Simplify PR_SET_MM on mm::code/data assignment

(which now in linux-next) allows us to setup code/data addresses
without requirement of underlied VMA. So revert commit
090513d5 and make code
more simplier
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>