vacuum analyze fails: ERROR: Unable to locate type oid 2230924 in catalog

vacuum analyze on pg_type fails if bogus entries remain in pg_operator.
Here is a sample script to reproduce the problem.

drop table t1;
create table t1(i int);
drop function foo(t1,t1);
create function foo(t1,t1) returns bool as 'select true' language 'sql';
create operator = (
leftarg = t1,
rightarg = t1,
commutator = =,
procedure = foo
);
drop table t1;
vacuum analyze;

To fix the problem I propose following patches. Comments?
--
Tatsuo Ishii

*** parse_coerce.c.orig Sat Feb 3 20:07:53 2001
--- parse_coerce.c Tue Feb 27 11:33:01 2001
***************
*** 190,195 ****
--- 190,201 ----
Oid inputTypeId = input_typeids[i];
Oid targetTypeId = func_typeids[i];

+ if (typeidIsValid(inputTypeId) == false)
+ return(false);
+
+ if (typeidIsValid(targetTypeId) == false)
+ return(false);
+
/* no problem if same type */
if (inputTypeId == targetTypeId)
continue;