[Swan-commit] Changes to ref refs/heads/main

[Andrew Cagney]

New commits:
commit 6d798e8f983395f8d8b54094eb296d65109c37a9
Author: Andrew Cagney <cagney at gnu.org>
Date:   Thu Sep 30 12:58:05 2021 -0400

    fd: add fd_{add,del}ref{,_where}()
    
    provide names somewhat consistent with other code using refcnt