bizgres - bizgres: Teach nodeSort and nodeMaterial to optimize out

Log Message:
-----------
Teach nodeSort and nodeMaterial to optimize out unnecessary overhead when the passed-down eflags indicate they can.
SimonRiggs and Tom Lane 

Modified Files:
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    bizgres/postgresql/src/backend/executor:
        execProcnode.c (r1.1.1.2.2.1 -> r1.3)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/bizgres/bizgres/postgresql/src/backend/executor/execProcnode.c.diff?r1=1.1.1.2.2.1&r2=1.3)
        functions.c (r1.1.1.2.2.1 -> r1.3)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/bizgres/bizgres/postgresql/src/backend/executor/functions.c.diff?r1=1.1.1.2.2.1&r2=1.3)