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

[Andrew Cagney]

New commits:
commit 29cd830f261964661c4aa4d750a8379e9195d7d5
Author: Andrew Cagney <cagney at gnu.org>
Date:   Fri Feb 19 22:44:38 2021 -0500

    memory: eliminate NULL_SHUNK, use NULL_HUNK