There are some 'mode' still pending removal.

Bug: v8:9708, v8:10506, v8:6949
Change-Id: Ie1dc0397241bf046ac9737666e700b98018b2ff5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2202906
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67861}