s390x/tcg: Implement 32/128 bit for VECTOR FP COMPARE *

In addition to 32/128bit variants, we also have to support the
"Signal-on-QNaN (SQ)" bit.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210608092337.12221-16-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>