x86 is now using relative rather than absolute addresses in its
exception table, so we add a sorter for these.  If there are
relocations on the __ex_table section, they are redundant and probably
incorrect after the sort, so they are zeroed out leaving them valid
and consistent.

Also use the unaligned safe accessors from tools/{be,le}_byteshift.h
Signed-off-by: NDavid Daney <david.daney@cavium.com>
Link: http://lkml.kernel.org/r/1335291795-26693-2-git-send-email-ddaney.cavm@gmail.comSigned-off-by: NH. Peter Anvin <hpa@zytor.com>

Using this build-time sort saves time booting as we don't have to burn
cycles sorting the exception table.
Signed-off-by: NDavid Daney <david.daney@cavium.com>
Link: http://lkml.kernel.org/r/1334872799-14589-2-git-send-email-ddaney.cavm@gmail.comSigned-off-by: NH. Peter Anvin <hpa@linux.intel.com>