pgsql: Since createplan.c no longer cares whether index operators are

Log Message:
-----------
Since createplan.c no longer cares whether index operators are lossy, it has
no particular need to do get_op_opfamily_properties() while building an
indexscan plan.  Postpone that lookup until executor start.  This simplifies
createplan.c a lot more than it complicates nodeIndexscan.c, and makes things
more uniform since we already had to do it that way for RowCompare
expressions.  Should be a bit faster too, at least for plans that aren't
re-used many times, since we avoid palloc'ing and perhaps copying the
intermediate list data structure.

Modified Files:
--------------
    pgsql/src/backend/executor:
        execQual.c (r1.228 -> r1.229)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execQual.c?r1=1.228&r2=1.229)
        nodeBitmapIndexscan.c (r1.26 -> r1.27)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeBitmapIndexscan.c?r1=1.26&r2=1.27)
        nodeIndexscan.c (r1.127 -> r1.128)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeIndexscan.c?r1=1.127&r2=1.128)
        nodeMergejoin.c (r1.90 -> r1.91)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeMergejoin.c?r1=1.90&r2=1.91)
    pgsql/src/backend/nodes:
        copyfuncs.c (r1.390 -> r1.391)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/copyfuncs.c?r1=1.390&r2=1.391)
        outfuncs.c (r1.324 -> r1.325)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/outfuncs.c?r1=1.324&r2=1.325)
    pgsql/src/backend/optimizer/path:
        indxpath.c (r1.228 -> r1.229)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/indxpath.c?r1=1.228&r2=1.229)
    pgsql/src/backend/optimizer/plan:
        createplan.c (r1.238 -> r1.239)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/createplan.c?r1=1.238&r2=1.239)
    pgsql/src/backend/utils/adt:
        selfuncs.c (r1.247 -> r1.248)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/selfuncs.c?r1=1.247&r2=1.248)
    pgsql/src/backend/utils/cache:
        lsyscache.c (r1.156 -> r1.157)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/cache/lsyscache.c?r1=1.156&r2=1.157)
    pgsql/src/include/executor:
        nodeIndexscan.h (r1.31 -> r1.32)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/executor/nodeIndexscan.h?r1=1.31&r2=1.32)
    pgsql/src/include/nodes:
        plannodes.h (r1.99 -> r1.100)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/plannodes.h?r1=1.99&r2=1.100)
    pgsql/src/include/utils:
        lsyscache.h (r1.122 -> r1.123)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/lsyscache.h?r1=1.122&r2=1.123)