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Use a dedicated bit to track the liveness state of an allocation.
This change allows us to detect double-free bugs and improves
the overall stability.

Additionally, use a more appropriate inlining strategy.

Bug: 1073933
Change-Id: I62584e48e85edfe5ecbc1213cde99c7228ecd3e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469569
Commit-Queue: Sergei Glazunov <glazunov@google.com>
Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837188}