Skip InstancingTest.NonIndexed* with non-zero Offset on Mac Mini 8.1
Skip InstancingTest.NonIndexed* with non-zero Offset on Mac Mini 8.1

Bug: angleproject:5271
Change-Id: I644b28670ce0501407797f7ae7e749a66a63d84e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2508975
Reviewed-by: Yuly Novikov <36f5580f63d0a3eacc17e89a61d11e2f646630d2@chromium.org>
Commit-Queue: Yuly Novikov <36f5580f63d0a3eacc17e89a61d11e2f646630d2@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle