Add test case exercising formerly-unreached code in inheritance_planner.

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

Commit: 8fba397f0ca7b9a1fd59ab2b676c057dde4f8219
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2019-03-31T19:49:06Z
Releases: 12.0
Add test case exercising formerly-unreached code in inheritance_planner.

There was some debate about whether the code I'd added to remap
AppendRelInfos obtained from the initial SELECT planning run is
actually necessary.  Add a test case demonstrating that it is.

Discussion: https://postgr.es/m/23831.1553873385@sss.pgh.pa.us

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