systemc: Report an error if notifying during the update phase.

Change-Id: If261c7a981a247884f0a6466756966b454f197f4
Reviewed-on: https://gem5-review.googlesource.com/c/12606
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
1 file changed