Avoid defaulted comparison operator Not available until C++20. Bug: angleproject:8046 Change-Id: I6f4093b0bdccca55818109836e2e0d68f66897b9 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4373861 Reviewed-by: Brian Osman <brianosman@google.com> Auto-Submit: Alexey Knyazev <lexa.knyazev@gmail.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>