Thread: pgsql: lmgr.c:DescribeLockTag was never taught about virtual xids, per

Log Message:
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lmgr.c:DescribeLockTag was never taught about virtual xids, per Greg Stark.
Also a couple of minor tweaks to try to future-proof the code a bit better
against future locktag additions.

Modified Files:
--------------
    pgsql/src/backend/storage/lmgr:
        lmgr.c (r1.95 -> r1.96)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/lmgr/lmgr.c?r1=1.95&r2=1.96)
    pgsql/src/backend/utils/adt:
        lockfuncs.c (r1.31 -> r1.32)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/lockfuncs.c?r1=1.31&r2=1.32)
    pgsql/src/include/storage:
        lock.h (r1.111 -> r1.112)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/storage/lock.h?r1=1.111&r2=1.112)