Allow svn_ra_get_file_revs2() and svn_repos_get_file_revs2() to report file revisions backwards. This to allow optimizing 'svn blame' in a future Subversion release without having to wait for yet another server upgrade to support this new feature.
* subversion/libsvn_repos/rev_hunt.c (svn_repos_get_file_revs2): Update comment. Detect reversed arguments, which would originally just return an error or no revisions.. and in that case reverse the revision array before walking it.
* subversion/tests/libsvn_repos/repos-test.c (test_get_file_revs): Extend test to also walk the revisions backwards.