Fix CL_EVENT macro Bug: angleproject:5745 Change-Id: Icbfab0d0bd4b1510b98d5ed746f4d3ddfa5ec36e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2752746 Commit-Queue: John Plate <jplate@google.com> Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>