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This is a continuation of crrev.com/c/2275886. If PA-Everywhere and
tagging for CheckedPtr were to be enabled, this test would've failed.
By switching to aligned root, we're making it pass in all situations.

Bug: 1092288, 998048
Change-Id: Ib638818cc1e433c937c3c6fd375a492f5b3b22ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2282837
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786170}