pgsql-server: Code review for ALTER INDEX patch.

Log Message:
-----------
Code review for ALTER INDEX patch.

Modified Files:
--------------
    pgsql-server/src/backend/commands:
        alter.c (r1.8 -> r1.9)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/commands/alter.c.diff?r1=1.8&r2=1.9)
    pgsql-server/src/backend/nodes:
        copyfuncs.c (r1.289 -> r1.290)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/nodes/copyfuncs.c.diff?r1=1.289&r2=1.290)
        equalfuncs.c (r1.228 -> r1.229)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/nodes/equalfuncs.c.diff?r1=1.228&r2=1.229)
    pgsql-server/src/backend/parser:
        analyze.c (r1.308 -> r1.309)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/parser/analyze.c.diff?r1=1.308&r2=1.309)
        gram.y (r2.472 -> r2.473)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/parser/gram.y.diff?r1=2.472&r2=2.473)