Build kernel with O3

Change-Id: I1e64cf9f5cf1fccd1186d3b15d078cf5a9756061

Conflicts:
	Makefile
Optimize flags in arm/arm

Change-Id: I24391eafb3bae3433fcc4a4230fbbf846b13d7fb
More flags for optimising

Change-Id: Icbfbd519b04376bce15f57638ec5f3dae7a5d98e

Conflicts:
	Makefile
change build to ALOT
Fix unwind

Change-Id: I421d3bba354f81d680a13053c8ec332dda01d78d