pgsql: Fix pull_up_simple_union_all to copy all rtable entries from

Log Message:
-----------
Fix pull_up_simple_union_all to copy all rtable entries from child subquery to
parent, not only those with RangeTblRefs. We need them in ExecCheckRTPerms.

Report by Brendan O'Shea. Back-patch to 8.2, where pull_up_simple_union_all
was introduced.

Tags:
----
REL8_3_STABLE

Modified Files:
--------------
    pgsql/src/backend/optimizer/prep:
        prepjointree.c (r1.49 -> r1.49.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/prep/prepjointree.c?r1=1.49&r2=1.49.2.1)
    pgsql/src/backend/rewrite:
        rewriteManip.c (r1.107 -> r1.107.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/rewrite/rewriteManip.c?r1=1.107&r2=1.107.2.1)
    pgsql/src/include/rewrite:
        rewriteManip.h (r1.44 -> r1.44.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/rewrite/rewriteManip.h?r1=1.44&r2=1.44.2.1)