- Update those counters from space
 - Add fast path for move memory

 Fix:
 - Introduce proper variants for checked arithmetic on atomics.

Previous revert was needed to unblock other reverts.

This reverts commit 651bd0de.

Bug: chromium:845409
Change-Id: I906ef6c60a589a30a0a632eadb8642735deaf0e4
Tbr: ulan@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/1221213Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55828}