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This test needs a case for what clang does on Mac Arm64, so add that.

Bug: 1128436,1121871
Change-Id: I5d57f99f7d041bc91d9fc862c1d10ddc1b48f540
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412552
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807243}