cpu-o3: Move O3 IEW stats to BaseCPU::ExecuteCPUStats

Moved numInsts, numBranches, numNop, numRefs, numLoadInsts, numRate to
Base. Merged numRefs into numMemRefs of ExecuteCPUStats. Renamed
numRate to instRate. Updated formatting in ExecuteCPUStats group.

Change-Id: I1fd3a989d917eb2ffaa865b067b80e266d6f55bc
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/67395
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
4 files changed