C++17 was fully enabled [1] a few days after the last try to remove the
workaround [2]. Let's try again now.

[1] https://crrev.com/c/3316556
[2] https://crrev.com/c/3306429

R=leszeks@chromium.org

Change-Id: I63696b69d8d47deead03b86822ad04fbe065d7d3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3785144Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81963}