Log Message:
-----------
Revert ill-fated patch to release exclusive lock early after vacuum
truncates a table. Introduces race condition, as shown by buildfarm
failures.
Modified Files:
--------------
pgsql/src/backend/commands:
vacuumlazy.c (r1.97 -> r1.98)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/vacuumlazy.c?r1=1.97&r2=1.98)