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Use the different spin loop primitives in some simple powerpc spin loops, including those which will spin as a common case. This will help to test the spin loop primitives before more conversions are done. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Add some includes of <linux/processor.h>] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>