target/s390x: implement COMPARE AND SIGNAL
These functions differ from COMPARE by generating an exception for a QNaN input. Use the non quiet version of floatXX_compare. Signed-off-by: NAurelien Jarno <aurelien@aurel32.net> Message-Id: <20170531220129.27724-10-aurelien@aurel32.net> Signed-off-by: NRichard Henderson <rth@twiddle.net>
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