Tweak palloc/repalloc to allow zero bytes to be requested, as per recent

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

Commit: c3a153afed84e29dac664bdc6123724a9e3a906f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-06-05T19:48:09Z
Releases: 8.0.0
Tweak palloc/repalloc to allow zero bytes to be requested, as per recent
proposal.  Eliminate several dozen now-unnecessary hacks to avoid palloc(0).
(It's likely there are more that I didn't find.)

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