This is quite within spec and protects our various back-ends from FB
loops. Also makes the check more cached for optimization purposes.

Bug: angleproject:4490
Change-Id: Ia82ec88244d07670d68ce53495b5893b8a75ac42
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2118153
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Cody Northrop <cnorthrop@google.com>