Remove the no-longer-useful HashItem/HashItemData level of structure.

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

Commit: 5997386a0a38f3ded28ce6eb2c2b4f110b377e46
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2006-01-25T23:26:11Z
Releases: 8.2.0
Remove the no-longer-useful HashItem/HashItemData level of structure.
Same motivation as for BTItem.

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