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

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

This reverts commit 0c62f5b3.

Bug: chromium:845409
Change-Id: I98ad1a7c470c7e7b805e087b4ec74e3451344712
Reviewed-on: https://chromium-review.googlesource.com/1219647Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55815}