Another round of cleanups for dynahash.c (maybe it's finally clean of

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

Commit: 5999e78fc45dcb91784b64b6e9ae43f4e4f68ca2
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2001-10-01T05:36:17Z
Releases: 7.2.1
Another round of cleanups for dynahash.c (maybe it's finally clean of
portability issues).  Caller-visible data structures are now allocated
on MAXALIGN boundaries, allowing safe use of datatypes wider than 'long'.
Rejigger hash_create API so that caller specifies size of key and
total size of entry, not size of key and size of rest of entry.
This simplifies life considerably since each number is just a sizeof(),
and padding issues etc. are taken care of automatically.

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