Merge branch 'blead' of ssh://perl5.git.perl.org/gitroot/perl into blead

* 'blead' of ssh://perl5.git.perl.org/gitroot/perl:
  Don't initialize end in pp_reverse when begin is NULL
  More tests for in-place reverse (empty tied array)
  Add a test for reversing in-place an empty array
  Avoid a segfault when reversing an empty array in-place.