Rearrange vacuum-related bits in PGPROC as a bitmask, to better support

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 745c1b2c2ab8385c8392ff10383a64527e3150b7
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2007-10-24T20:55:36Z
Releases: 8.3.0
Rearrange vacuum-related bits in PGPROC as a bitmask, to better support
having several of them.  Add two more flags: whether the process is
executing an ANALYZE, and whether a vacuum is for Xid wraparound (which
is obviously only set by autovacuum).

Sneakily move the worker's recently-acquired PostAuthDelay to a more useful
place.

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