Code review for CREATE OR REPLACE VIEW patch. Do things in a saner order to

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

Commit: 4da65a23e7d8821b8eff8075add93caef471d4f8
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2008-12-15T21:35:31Z
Releases: 8.4.0
Code review for CREATE OR REPLACE VIEW patch.  Do things in a saner order to
result in hopefully-less-confusing error messages when the new definition
isn't compatible with the old; minor other cleanup.

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