Improve handling of temporary allocations in svn_mergeinfo_intersect2().
Improve handling of temporary allocations in svn_mergeinfo_intersect2().

* subversion/libsvn_subr/mergeinfo.c
  (svn_mergeinfo_intersect2): Use an iterpool while looping over the
   mergeinfo hash and pass it as scratch pool to svn_rangelist_intersect().
   Also, allocate the temporary hash iteration index in the scratch pool
   rather than in the pool in which the provided mergeinfo hash was allocated.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1176915 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion