Mechanical change to use std:: atomics instead.

Change-Id: If64cc972eb247c93e7080e9eb764cbc6b2cf35ce
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2172966Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67487}