x86/asm: add cpu_relax()
This will be useful to be put inside loops. Suggested-by:Andrew Jones <drjones@redhat.com> Reviewed-by:
Andrew Jones <drjones@redhat.com> Signed-off-by:
Peter Xu <peterx@redhat.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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