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localrepo: rename crev in _filecommit() to cnode, since it's a node

Authored by martinvonz.

Description

localrepo: rename crev in _filecommit() to cnode, since it's a node

I know we often use "rev" generically, but here's it always a node, so
it helps to be specific.

Differential Revision: https://phab.mercurial-scm.org/D6181