GitLab

Refactor SlotMetadata to break out matching allocation/deallocation info
into a common struct.

Bug: 896019
Change-Id: I6955e43048a30977b502db21f254faf9796d643c
Reviewed-on: https://chromium-review.googlesource.com/c/1338236
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608550}