Also show constant for ArchNops that encode assigning from a
constant.

Change-Id: I84590005dda62ebf445aada57f826f5ffcd5a802
Bug: v8:7327
Notry: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1672943
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62388}