asmlinkage: Revert "lto: Make asmlinkage __visible"

As requested by Linus, revert adding __visible to asmlinkage.
Instead we add __visible explicitely to all the symbols
that need it.

This reverts commit 128ea04a.

Link: http://lkml.kernel.org/r/1398984278-29319-2-git-send-email-andi@firstfloor.org


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