tree 90fd38b1d59957026d0d39dead51a3e81cf1fd1a
parent c396233711ae3ced7863e778d6008b323cb950eb
author Jonathan Nieder <jrn@google.com> 1551996657 -0800
committer Jonathan Nieder <jrn@google.com> 1551996657 -0800

Require a RevWalk when building CommitData

All callers have a RevWalk conveniently available, so simplify by
assuming one is always present.

Change-Id: I9fc83122c3af2240c9c4e39c585af93496ea17aa