pgsql: During CatCacheRemoveCList, we must now remove any members that

Log Message:
-----------
During CatCacheRemoveCList, we must now remove any members that are
dead and have become unreferenced.  Before 8.1, such members were left
for AtEOXact_CatCache() to clean up, but now AtEOXact_CatCache isn't
supposed to have anything to do.  In an assert-enabled build this bug
leads to an assertion failure at transaction end, but in a non-assert
build the dead member is effectively just a small memory leak.
Per report from Jeremy Drake.

Modified Files:
--------------
    pgsql/src/backend/utils/cache:
        catcache.c (r1.126 -> r1.127)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/cache/catcache.c.diff?r1=1.126&r2=1.127)