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reduce_heads(): reimplement on top of remove_redundant()
This is used by "git merge" and "git merge-base --independent" but used to use a similar N*(N-1) traversals to reject commits that are ancestors of other commits. Reimplement it on top of remove_redundant(). Note that the callers of this function are allowed to pass the same commit more than once, but remove_redundant() is designed to be fed each commit only once. The function removes duplicates before calling remove_redundant(). Signed-off-by: Junio C Hamano <firstname.lastname@example.org>
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