pgsql: Modify LOOPBYTE/LOOPBIT macros to be more logical; rather than

Log Message:
-----------
Modify LOOPBYTE/LOOPBIT macros to be more logical;  rather than have the
for() body passed as a parameter, make the macros act as simple headers
to code blocks.

This allows pgindent to be run on these files.

Modified Files:
--------------
    pgsql/contrib/hstore:
        hstore_gist.c (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/hstore_gist.c?r1=1.5&r2=1.6)
    pgsql/contrib/intarray:
        _int.h (r1.13 -> r1.14)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/_int.h?r1=1.13&r2=1.14)
        _intbig_gist.c (r1.14 -> r1.15)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/_intbig_gist.c?r1=1.14&r2=1.15)
    pgsql/contrib/ltree:
        _ltree_gist.c (r1.20 -> r1.21)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/_ltree_gist.c?r1=1.20&r2=1.21)
        ltree.h (r1.18 -> r1.19)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/ltree.h?r1=1.18&r2=1.19)
        ltree_gist.c (r1.20 -> r1.21)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/ltree_gist.c?r1=1.20&r2=1.21)
    pgsql/contrib/pg_trgm:
        trgm.h (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_trgm/trgm.h?r1=1.7&r2=1.8)
        trgm_gist.c (r1.10 -> r1.11)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_trgm/trgm_gist.c?r1=1.10&r2=1.11)
    pgsql/src/backend/utils/adt:
        tsgistidx.c (r1.4 -> r1.5)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/tsgistidx.c?r1=1.4&r2=1.5)