pgsql: Fix another problem in 8.2 changes that allowed "one-time" qual

Log Message:
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Fix another problem in 8.2 changes that allowed "one-time" qual conditions to
be checked at plan levels below the top; namely, we have to allow for Result
nodes inserted just above a nestloop inner indexscan.  Should think about
using the general Param mechanism to pass down outer-relation variables, but
for the moment we need a back-patchable solution.  Per report from Phil Frost.

Tags:
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REL8_2_STABLE

Modified Files:
--------------
    pgsql/src/backend/executor:
        nodeResult.c (r1.34.2.3 -> r1.34.2.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeResult.c.diff?r1=1.34.2.3&r2=1.34.2.4)
    pgsql/src/backend/optimizer/plan:
        setrefs.c (r1.126 -> r1.126.2.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/setrefs.c.diff?r1=1.126&r2=1.126.2.1)