This will assure that ANGLE ASSERT macros work in Release.

Bug: angleproject:5114
Change-Id: I0fe6b83592ac3ff3462e55b8a73a11c8f114a4a7
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2875355Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>