s390x/tcg: fix FP register pair checks
Valid register pairs are 0/2, 1/3, 4/6, 5/7, 8/10, 9/11, 12/14, 13/15. R1/R2 always selects the lower number, so the current checks are not correct as e.g. 2/4 could be selected as a pair. Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Reviewed-by: NThomas Huth <thuth@redhat.com> Signed-off-by: NDavid Hildenbrand <david@redhat.com> Message-Id: <20180927130303.12236-9-david@redhat.com> Signed-off-by: NCornelia Huck <cohuck@redhat.com>
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