[PATCH] Speedup recursive by flushing index only once for all entries

Merge-recursive is very slow in repos with lots of files,
especially if lots of them change absolutely identically.
Updating index once after all of them changes speedups
merge quite noticable.

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
---

Johannes, I remember suggesting to do index flush for all
entries instead for every entry. It is already quite time ago,
but ... was there any reasons for not doing this?
The patch speeds it up a lot and no wonder: index is 6Mb
here, and this is cygwin.

 merge-recursive.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

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