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This also makes PartitionRoot::total_size_of_*_pages atomic. Since there
are no side effects around reading/writing them (other than the
invariant check), using the relaxed semantics should be safe.

Bug: 11297512
Change-Id: Ibeb74484f25ba915a1b31659f3c2d6e13560f83b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506441Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822658}