Improve a number of elog messages for not-supposed-to-happen cases in btrees,

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

Commit: ac1ae9f2fac089305953636df66f83cb75edf8da
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-12-31T04:52:05Z
Releases: 8.3.0
Improve a number of elog messages for not-supposed-to-happen cases in btrees,
since these seem to happen after all in corrupted indexes.  Make sure we
supply the index name in all cases, and provide relevant block numbers where
available.  Also consistently identify the index name as such.

Back-patch to 8.2, in hopes that this might help Mason Hale figure out his
problem.

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