Allow ShowBufferUsage() to report the number of reads/writes that have

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

Commit: 35c2a3c3cf8ef497b090c9dbfae1bf565c62b2a3
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2008-09-17T13:15:55Z
Releases: 8.4.0
Allow ShowBufferUsage() to report the number of reads/writes that have
occurred to temporary files.  This replaces the unused
NDirectFileRead/NDirectFileWrite counters.

Itagaki Takahiro

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