Modified the Athlon event table based on input from Anoop Iyer of AMD; Removed the need for the previously implemented DERIVED_SUB underflow fix -- at least for Athlon.
Modified the Athlon event table based on input from Anoop Iyer of AMD;
Removed the need for the previously implemented DERIVED_SUB
underflow fix -- at least for Athlon.

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