See
https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-override.html
for more on this warning.

Bug: v8:10488
Change-Id: Ic885590553364db58259ed1d211b3ace4bfe9d23
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2233984Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68298}