cutils: Rewrite x86 buffer zero checking
Handle alignment of buffers, so that the vector paths can be used more often. Signed-off-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Message-Id: <1473800239-13841-1-git-send-email-rth@twiddle.net> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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