Capture/Replay: Allow capturing Gen/Delete with zero elements This is allowed, and hence the capture/replay should also work. Bug: angleproject:6558 Change-Id: Iae40e2870f9ff121c8396ee4c0caf0905d3fd84c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3220632 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Gert Wollny <gert.wollny@collabora.com>