cpu-o3: convert fetch to new style stats

Change-Id: Ib50a303570ac1dd45ff11a32a823f47a6c4c02cd
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/33815
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
3 files changed