s390x/tcg: Implement VECTOR GENERATE BYTE MASK
Let's optimize it for the common cases (setting a vector to zero or all ones) - courtesy of Richard. Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Signed-off-by: NDavid Hildenbrand <david@redhat.com> Message-Id: <20190307121539.12842-6-david@redhat.com> Signed-off-by: NCornelia Huck <cohuck@redhat.com>
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