bizgres - bizgres: Fix inconsistent visibility declarations with

Log Message:
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Fix inconsistent visibility declarations with LockData structures.
Also add in a couple of Asserts that were left off.

Modified Files:
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bizgres/postgresql/src/backend/storage/lmgr:
lock.c (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/bizgres/bizgres/postgresql/src/backend/storage/lmgr/lock.c.diff?r1=1.5&r2=1.6)