When a thread gets archived, we still need to scan and update debug
roots on GCs for it. Otherwise we restore stale references when the
thread becomes active again.

Bug: v8:11145
Change-Id: I88f4c1534e826aed222e7fb67bd82bb0a4758fab
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2537691Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71221}