pg_upgrade fix for pg_largeobject_metadata

The attached, applied patch preserves
pg_largeobject_metadata.relfrozenxid in pg_upgrade.

This is needed only in 9.1 because only 9.0 had this table and no one is
upgrading from a 9.0 beta to 9.0 anymore.  We basically don't backpatch
9.0 beta fixes at this point.

--
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
new file mode 100644
index 90cb9ab..3f6e77b
*** a/src/bin/pg_dump/pg_dump.c
--- b/src/bin/pg_dump/pg_dump.c
***************
*** 50,55 ****
--- 50,56 ----
  #include "catalog/pg_class.h"
  #include "catalog/pg_default_acl.h"
  #include "catalog/pg_largeobject.h"
+ #include "catalog/pg_largeobject_metadata.h"
  #include "catalog/pg_proc.h"
  #include "catalog/pg_trigger.h"
  #include "catalog/pg_type.h"
*************** dumpDatabase(Archive *AH)
*** 1920,1927 ****
                   NULL);            /* Dumper Arg */

      /*
!      * pg_largeobject comes from the old system intact, so set its
!      * relfrozenxid.
       */
      if (binary_upgrade)
      {
--- 1921,1928 ----
                   NULL);            /* Dumper Arg */

      /*
!      * pg_largeobject and pg_largeobject_metadata come from the old system
!      * intact, so set their relfrozenxids.
       */
      if (binary_upgrade)
      {
*************** dumpDatabase(Archive *AH)
*** 1930,1935 ****
--- 1931,1939 ----
          PQExpBuffer loOutQry = createPQExpBuffer();
          int            i_relfrozenxid;

+         /*
+          *    pg_largeobject
+          */
          appendPQExpBuffer(loFrozenQry, "SELECT relfrozenxid\n"
                            "FROM pg_catalog.pg_class\n"
                            "WHERE oid = %u;\n",
*************** dumpDatabase(Archive *AH)
*** 1946,1952 ****

          i_relfrozenxid = PQfnumber(lo_res, "relfrozenxid");

!         appendPQExpBuffer(loOutQry, "\n-- For binary upgrade, set pg_largeobject relfrozenxid.\n");
          appendPQExpBuffer(loOutQry, "UPDATE pg_catalog.pg_class\n"
                            "SET relfrozenxid = '%u'\n"
                            "WHERE oid = %u;\n",
--- 1950,1956 ----

          i_relfrozenxid = PQfnumber(lo_res, "relfrozenxid");

!         appendPQExpBuffer(loOutQry, "\n-- For binary upgrade, set pg_largeobject.relfrozenxid\n");
          appendPQExpBuffer(loOutQry, "UPDATE pg_catalog.pg_class\n"
                            "SET relfrozenxid = '%u'\n"
                            "WHERE oid = %u;\n",
*************** dumpDatabase(Archive *AH)
*** 1960,1965 ****
--- 1964,2010 ----
                       NULL, NULL);

          PQclear(lo_res);
+
+         /*
+          *    pg_largeobject_metadata
+          */
+         if (g_fout->remoteVersion >= 90000)
+         {
+             resetPQExpBuffer(loFrozenQry);
+             resetPQExpBuffer(loOutQry);
+
+             appendPQExpBuffer(loFrozenQry, "SELECT relfrozenxid\n"
+                               "FROM pg_catalog.pg_class\n"
+                               "WHERE oid = %u;\n",
+                               LargeObjectMetadataRelationId);
+
+             lo_res = PQexec(g_conn, loFrozenQry->data);
+             check_sql_result(lo_res, g_conn, loFrozenQry->data, PGRES_TUPLES_OK);
+
+             if (PQntuples(lo_res) != 1)
+             {
+                 write_msg(NULL, "dumpDatabase(): could not find pg_largeobject_metadata.relfrozenxid\n");
+                 exit_nicely();
+             }
+
+             i_relfrozenxid = PQfnumber(lo_res, "relfrozenxid");
+
+             appendPQExpBuffer(loOutQry, "\n-- For binary upgrade, set pg_largeobject_metadata.relfrozenxid\n");
+             appendPQExpBuffer(loOutQry, "UPDATE pg_catalog.pg_class\n"
+                               "SET relfrozenxid = '%u'\n"
+                               "WHERE oid = %u;\n",
+                               atoi(PQgetvalue(lo_res, 0, i_relfrozenxid)),
+                               LargeObjectMetadataRelationId);
+             ArchiveEntry(AH, nilCatalogId, createDumpId(),
+                          "pg_largeobject_metadata", NULL, NULL, "",
+                          false, "pg_largeobject_metadata", SECTION_PRE_DATA,
+                          loOutQry->data, "", NULL,
+                          NULL, 0,
+                          NULL, NULL);
+
+             PQclear(lo_res);
+         }
+
          destroyPQExpBuffer(loFrozenQry);
          destroyPQExpBuffer(loOutQry);
      }
*************** dumpTableSchema(Archive *fout, TableInfo
*** 12176,12182 ****
                  }
              }

!             appendPQExpBuffer(q, "\n-- For binary upgrade, set relfrozenxid.\n");
              appendPQExpBuffer(q, "UPDATE pg_catalog.pg_class\n"
                                "SET relfrozenxid = '%u'\n"
                                "WHERE oid = ",
--- 12221,12227 ----
                  }
              }

!             appendPQExpBuffer(q, "\n-- For binary upgrade, set relfrozenxid\n");
              appendPQExpBuffer(q, "UPDATE pg_catalog.pg_class\n"
                                "SET relfrozenxid = '%u'\n"
                                "WHERE oid = ",