Log Message:
-----------
Add test to WAL replay to verify that xl_prev points back to the previous
WAL record; this is necessary to be sure we recognize stale WAL records
when a WAL page was only partially written during a system crash.

Tags:
----
REL8_0_STABLE

Modified Files:
--------------
    pgsql/src/backend/access/transam:
        xlog.c (r1.180.4.2 -> r1.180.4.3)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xlog.c.diff?r1=1.180.4.2&r2=1.180.4.3)

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