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

Bug: v8:10488
Change-Id: Ia2bf5c1ec84dd4473d0e013ec3d22548b38a0578
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2211190Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67983}