Merge git://git.bogomips.org/git-svn

* git://git.bogomips.org/git-svn:
  test case for regression caused by git-svn empty symlink fix
  git-svn: fix broken symlink workaround when switching branches
  git-svn: Print revision while searching for earliest use of path
  git-svn: abstract out a block into new method other_gs()
  git-svn: allow disabling expensive broken symlink checks