ARM: module: add text.unlikely section to unwind

Add handling for the .text.unlikely unwind sections for cases where
real used code get incorrectly placed by compiler. This solves cases
in which a frequently used function triggers the collectoin of the
current stack trace when using CONFIG_ARM_UNWIND. An example would
be when using CONFIG_SLUB_DEBUG. The constant error printing can
flood the kernel log buffers and cause sluggishness.

Change-Id: I8ca99de24695a46e7fe461b5687c824b900908c8
Signed-off-by: Jason Hrycay <jason.hrycay@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/527901
SLT-Approved: Gerrit Code Review <gerrit-blurdev@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Christopher Fries <qcf001@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Reviewed-by: Check Patch <CHEKPACH@motorola.com>
Reviewed-by: Klocwork kwcheck <klocwork-kwcheck@sourceforge.mot.com>