See
https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-equals-default.html
and
https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-override.html.

Also see
https://chromium.googlesource.com/chromium/src/+/HEAD/styleguide/c++/c++-dos-and-donts.md#prefer-to-use.

Bug: v8:10488
Change-Id: Id377cab4db7ff211e800b2078ab91c3deb9a1b21
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2191350Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67722}