If the key specified on IWM4MCRE was a user key (8-F), then all
of the following must be true:
Caller must be in non-cross-memory mode (PASN=SASN=HASN). This
implies that the current primary must match the primary at the time
that IWM4MCRE was invoked.
Must be in task mode (not SRB)
Current task must match the task at the time that IWM4MCRE was
invoked.