Prevent a rowtype from being included in itself via a range.

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

Commit: 31dfa40a834177b8e989a59252ee3ce1a3309075
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2019-12-23T17:08:24Z
Releases: 11.7
Prevent a rowtype from being included in itself via a range.

We probably should have thought of this case when ranges were added,
but we didn't.  (It's not the fault of commit eb51af71f, because
ranges didn't exist then.)

It's an old bug, so back-patch to all supported branches.

Discussion: https://postgr.es/m/7782.1577051475@sss.pgh.pa.us

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