This could happen for specific values of the 'dest' target.

Bug: chromium:1219082
Change-Id: Ic19a5dc4a95531f9513403ad9c97a4b4c5dc5a6f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2961070Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>