defconfig: Enable -02 Optimisations
kernel/return_address.c: hide warning

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
Remove another debug object.
ARM: msm: remove clock-debug
ARM: msm: disable nohlt debugfs node
Kernel: sched: Remove Sched_Debug (thx @morfic)
msm: remove smd_debug
msm: remove perf_debug