Make "tree_entry" have a SHA1 instead of a union of object pointers
This is preparatory work for further cleanups, where we try to make tree_entry look more like the more efficient tree-walk descriptor. Signed-off-by: NLinus Torvalds <torvalds@osdl.org> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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