Rework the -e option to display unit mask information for events that have unit masks defined but not specified.
Rework the -e option to display unit mask information for events that have
unit masks defined but not specified.

arm-hpc/papi,pyrovski/papi,arm-hpc/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi