This just adds the same case we already added in
https://chromium-review.googlesource.com/c/v8/v8/+/1478192
for conversions to tagged representation.

Bug: chromium:957559
Change-Id: I62a388ba47bd72d65fa07d0141362d7f1383c96e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1588428Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61115}