Reject ANALYZE commands during VACUUM FULL or another ANALYZE.

Noah Misch <noah@leadboat.com>

Commit: 616830052ba3ed8abc52ba215f53d55f8413eae9
Author: Noah Misch <noah@leadboat.com>
Date: 2015-01-08T03:34:30Z
Releases: 9.1.15
Reject ANALYZE commands during VACUUM FULL or another ANALYZE.

vacuum()'s static variable handling makes it non-reentrant; an ensuing
null pointer deference crashed the backend.  Back-patch to 9.0 (all
supported versions).

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