These were messing up the test runner when used in combination
with the test runner's specific args.

Make it an error if the arguments are used together.

Bug: angleproject:3162
Change-Id: I6fa1c0fb346a8c376ca455f7f4bf0492cfc0198a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2414931Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>