Always make a BufferAccessStrategy for ANALYZE
32fbe0239 changed things so we didn't bother allocating the
BufferAccessStrategy during VACUUM (ONLY_DATABASE_STATS); and VACUUM
(FULL), however, it forgot to consider that VACUUM (FULL, ANALYZE) is a
possible combination. That change would have resulted in such a command
allowing ANALYZE to make full use of shared buffers, which wasn't
intended, so fix that.
Reported-by: Melanie Plageman
Discussion: https://postgr.es/m/CAAKRu_bJRKe+v_=OqwC+5sA3j5qv8rqdAwy3+yHaO3wmtfrCRg@mail.gmail.com