Replace pg_class.relhasexclusion with pg_index.indisexclusion.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: bd1ad1b019cda851a3e925133c056930368e6424
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2011-01-25T22:51:59Z
Releases: 9.1.0
Replace pg_class.relhasexclusion with pg_index.indisexclusion.

There isn't any need to track this state on a table-wide basis, and trying
to do so introduces undesirable semantic fuzziness.  Move the flag to
pg_index, where it clearly describes just a single index and can be
immutable after index creation.

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