Merge changes from topic 'rc-cleanup' * changes: Use refsByChange Multimap to build changeRefsById in ReceiveCommits Lazily load the changes byKey map in autoCloseChanges Simplify autoCloseCommits() handling of exact SHA-1 matches Cache reused values in autoCloseChanges Simplify parseBody call when looking at changes to close Refactor auto close change filtering in ReceiveCommits