It's deprecated in C++17 and not needed (it was needed for
static const, but not for constexpr)

Bug: chromium:1274247
Change-Id: If92d7b6300493cb186ff2ade8f6b6a4820d5a264
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3306429
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78149}