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

[D. Hugh Redelmeier]

New commits:
commit d45c21fbf3e4493545ba7070d24735e6c1573ce5
Author: D. Hugh Redelmeier <hugh at mimosa.com>
Date:   Thu Feb 25 10:57:31 2021 -0500

    pervasive: add and exploit replace_chunk()