Suppressing IDIXDCAP real-time analysis if prior exit RC=(PREVEXIT)

To suppress Fault Analyzer real-time analysis via the IDIXDCAP pre-dump invocation exit, if a prior pre-dump exit has set RC=8 to suppress the dump, set the PREVEXIT options field to 1.

The PREVEXIT options field replaces the deprecated IDISOPT2 SMP/E USERMOD.