This change fixes two cases of range loops, one where we can't use lvalue reference, and one more where we have to use an lvalue reference as we can't create a copy. In both cases clang would warn. Change-Id: I760aa094af66be32a150bad37acc21d6fd512a65 Signed-off-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/34776 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>