This adds basic oprofile support to ppc32.  Originally from Anton
Blanchard, I just re-diffed it against current kernels.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>