Clean up MultiXactIdExpand's API by separating out the case where we

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

Commit: 126eaef651ec96a48b18a111aa888b9be46e16fa
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-05-03T19:42:41Z
Releases: 8.1.0
Clean up MultiXactIdExpand's API by separating out the case where we
are creating a new MultiXactId from two regular XIDs.  The original
coding was unnecessarily complicated and didn't save any code anyway.

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