[PATCH 3/3] diff-index: pass pathspec down to unpack-trees machinery

And finally, pass the pathspec down through unpack_trees() to traverse_trees()
callchain.

Before and after applying this series, looking for changes in the kernel
repository with a fairly narrow pathspec gets a moderate speeds up.

  (without patch)
  $ /usr/bin/time git diff --raw v2.6.27 -- net/ipv6 >/dev/null
  0.48user 0.05system 0:00.53elapsed 100%CPU (0avgtext+0avgdata 163296maxresident)k
  0inputs+952outputs (0major+11163minor)pagefaults 0swaps

  (with patch)
  $ /usr/bin/time git diff --raw v2.6.27 -- net/ipv6 >/dev/null
  0.01user 0.00system 0:00.02elapsed 104%CPU (0avgtext+0avgdata 43856maxresident)k
  0inputs+24outputs (0major+3688minor)pagefaults 0swaps

Signed-off-by: Junio C Hamano <redacted>
---
 diff-lib.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/diff-lib.c b/diff-lib.c
index f8454dd..ebe751e 100644
--- a/diff-lib.c
+++ b/diff-lib.c

@@ -468,6 +468,7 @@ static int diff_cache(struct rev_info *revs,
 	opts.unpack_data = revs;
 	opts.src_index = &the_index;
 	opts.dst_index = NULL;
+	opts.pathspec = &revs->diffopt.pathspec;
 
 	init_tree_desc(&t, tree->buffer, tree->size);
 	return unpack_trees(1, &t, &opts);

-- 
1.7.7.rc0.70.g82660