Copy over changes that had been made to s_engpgm in GCN3 but weren't added to the Vega implementation Change-Id: I1063f83b1ce8f7c5e451c8c227265715c8f725b9 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47519 Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com> Reviewed-by: Matthew Poremba <matthew.poremba@amd.com> Reviewed-by: Alex Dutu <alexandru.dutu@amd.com> Maintainer: Matt Sinclair <mattdsinclair@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>