pgsql: Replace slightly klugy create_bitmap_restriction() function with

Log Message:
-----------
Replace slightly klugy create_bitmap_restriction() function with a
more efficient routine in restrictinfo.c (which can make use of
make_restrictinfo_internal).

Modified Files:
--------------
    pgsql/src/backend/optimizer/path:
        orindxpath.c (r1.69 -> r1.70)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/orindxpath.c.diff?r1=1.69&r2=1.70)
    pgsql/src/backend/optimizer/plan:
        createplan.c (r1.185 -> r1.186)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/createplan.c.diff?r1=1.185&r2=1.186)
    pgsql/src/backend/optimizer/util:
        restrictinfo.c (r1.34 -> r1.35)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/restrictinfo.c.diff?r1=1.34&r2=1.35)
    pgsql/src/include/optimizer:
        planmain.h (r1.83 -> r1.84)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/optimizer/planmain.h.diff?r1=1.83&r2=1.84)
        restrictinfo.h (r1.28 -> r1.29)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/optimizer/restrictinfo.h.diff?r1=1.28&r2=1.29)