Remove ASSERT from AtomicSerial, use static_assert ASSERT is not constexpr, while the AtomicSerial constructor was. This would cause compile errors. Bug: angleproject:7989 Change-Id: Ib6a438d4c055378d4f2f667285b0d2e99f2522ad Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4205892 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Auto-Submit: Kimmo Kinnunen <kkinnunen@apple.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>