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(parent: 82c3cd9) | patch

amcheck: MAXALIGN() nbtree special area offset.

amcheck: MAXALIGN() nbtree special area offset.

This isn't strictly necessary, but in theory it might matter if in the
future the width of the nbtree special area changes -- its total size
might not be an even number of MAXALIGN() quantums, even with padding.
PageInit() MAXALIGN()s all special area offsets, but amcheck uses the
offset to perform initial basic validation of line pointers, so we don't
rely on the offset from the page header.

The real reason to do this is to set a good example for new code that
adds amcheck coverage for other index AMs.

Reported-By: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Discussion: https://postgr.es/m/CALj2ACUMqTR9nErh99FbOBmzCXE9=gXNqhBiwYOhejJJS1LXqQ@mail.gmail.com

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