rev-list: memory usage reduction.
We do not need to track object refs, neither we need to save commit unless we are doing verbose header. A lot of traversal happens inside prepare_revision_walk() these days so setting things up before calling that function is necessary. Signed-off-by: NJunio C Hamano <junkio@cox.net> Acked-by: NLinus Torvalds <torvalds@osdl.org>
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