Push the membuffer cache L1 retention rate even further up to almost perfect short-term caching.  When we need to drop an entry due to index table overflow, drop L2 entries rather than L1 ones.
Push the membuffer cache L1 retention rate even further up to
almost perfect short-term caching.  When we need to drop an entry
due to index table overflow, drop L2 entries rather than L1 ones.

* subversion/libsvn_subr/cache-membuffer.c
  (find_entry): don't drop L1 entries when there are also L2 ones

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1519278 13f79535-47bb-0310-9956-ffa450edef68

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