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

[Andrew Cagney]

New commits:
commit 8b6ac7888ce17616f0b2b928280418fd13371d3f
Author: Andrew Cagney <cagney at gnu.org>
Date:   Fri Feb 8 10:38:20 2019 -0500

    shunks: rename empty_shunk to null_shunk
    
    Like for strings, NULL and "" are different.