VecRegOperand also need setRegOperand method to write back execution result. Change-Id: Ie50606014827c14a7219558dd003eb4747231649 Co-authored-by: Xuan Hu <huxuan@bosc.ac.cn> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/67292 Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu> Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com> Tested-by: kokoro <noreply+kokoro@google.com>