psql: treat "--" comments between queries as separate history entries.

If we've not yet collected any non-whitespace, non-comment token for a
new query, flush the current input line to history before reading
another line.  This aligns psql's history behavior with the observation
that lines containing only comments are generally not thought of as
being part of the next query.  psql's prompting behavior is consistent
with that view, too, since it won't change the prompt until you
enter something that's neither whitespace nor a "--" comment.

Greg Nancarrow, simplified a bit by me

Discussion: https://postgr.es/m/CAJcOf-cAdMVr7azeYR7nWKsNp7qhORzc84rV6d7m7knG5Hrtsw@mail.gmail.com

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