Remove useless LockDisable() function and associated overhead, per my

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 3d59ad00e8cc6a1bd919280be839fca152149ec2
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2001-09-27T16:29:13Z
Releases: 7.2.1
Remove useless LockDisable() function and associated overhead, per my
proposal of 26-Aug.

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