Remove BufferLocks[] array in favor of a single pointer to the buffer

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

Commit: 1c2de4774620469375e6393fbdbcdaffb0c2d0b5
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-10-16T18:05:07Z
Releases: 8.0.0
Remove BufferLocks[] array in favor of a single pointer to the buffer
(if any) currently waited for by LockBufferForCleanup(), which is all
that we were using it for anymore.  Saves some space and eliminates
proportional-to-NBuffers slowdown in UnlockBuffers().

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