This is a cherry-pick of following upstream commit:

Author: Tom Lane <tgl@sss.pgh.pa.us>
Date:   Thu Jul 10 02:14:03 2008 +0000

    Tighten up SS_finalize_plan's computation of valid_params to exclude Params of
    the current query level that aren't in fact output parameters of the current
    initPlans.  (This means, for example, output parameters of regular subplans.)
    To make this work correctly for output parameters coming from sibling
    initplans requires rejiggering the API of SS_finalize_plan just a bit:
    we need the siblings to be visible to it, rather than hidden as
    SS_make_initplan_from_plan had been doing.  This is really part of my response
    to bug #4290, but I concluded this part probably shouldn't be back-patched,
    since all that it's doing is to make a debugging cross-check tighter.

    (cherry picked from commit eaf1b5d3)