merge-recursive: track information associated with directory renames

merge-recursive: track information associated with directory renames

Directory rename detection previously silently applied.  In order to
allow printing information about paths that changed or printing a
conflict notification (and only doing so near other potential conflict
messages associated with the paths), save this information inside the
rename struct for later use.  A subsequent patch will make use of the
additional information.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>