Log Message:
-----------
Adjust time qual checking code so that we always check TransactionIdIsInProgress
before we check commit/abort status.  Formerly this was done in some paths
but not all, with the result that a transaction might be considered
committed for some purposes before it became committed for others.
Per example found by Jan Wieck.

Tags:
----
REL8_0_STABLE

Modified Files:
--------------
    pgsql/src/backend/utils/time:
        tqual.c (r1.81 -> r1.81.4.1)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/time/tqual.c.diff?r1=1.81&r2=1.81.4.1)

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