Improve merge algorithm used for target trees with child paths which have mergeinfo t

http://subversion.tigris.org/issues/show_bug.cgi?id=2821







------- Additional comments from kameshjtigris.org Thu Sep 27 03:55:10 -0700 2007 -------
Thanks Senthil.

I could see tremendous performance improvement with my new
patch as below.

Over ra_local
Old style of merging
--------------------
real    1m41.191s
user    0m2.637s
sys     0m0.594s
New style of merging
---------------
real    0m1.531s
user    0m1.009s
sys     0m0.152s


Over ra_dav(server on a localhost).
Old style of merging
----------------------
real    1m46.367s
user    0m1.898s
sys     0m0.526s

New style of merging
--------------------
real    0m5.442s
user    0m1.377s
sys     0m0.222s

With my latest patch all the tests passes too.

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