x86, asmlinkage: Change dotraplinkage into __visible on 32bit

Mark 32bit dotraplinkage functions as __visible for LTO.
64bit already is using asmlinkage which includes it.

v2: Clean up (M.Marek)

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1375740170-7446-3-git-send-email-andi@firstfloor.org


Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>