fastmodel: Implement inst count events in the IRIS thread contexts.

These use the IRIS stepping API.

Change-Id: Ib45744cb0928fece664187e4df6b25b064b19f0e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/22115
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed