pgsql-server: Convert pg_stat_get_backend_idset to use the existing SRF

Great. That old code was a mess.

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Tom Lane wrote:

Log Message:
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Convert pg_stat_get_backend_idset to use the existing SRF support.
This seems the cleanest way of fixing its lack of a shutdown callback,
which was preventing it from working correctly in a query that didn't
run it to completion. Per bug report from Szima G���bor.

Tags:
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REL7_4_STABLE

Modified Files:
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pgsql-server/src/backend/utils/adt:
pgstatfuncs.c (r1.17 -> r1.17.2.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/adt/pgstatfuncs.c.diff?r1=1.17&r2=1.17.2.1)

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