Prevent (auto)vacuum from truncating first page of populated matview.

Kevin Grittner <kgrittn@postgresql.org>

Commit: b69ec7cc990fd8da75ed4c232899503217d7b9ae
Author: Kevin Grittner <kgrittn@postgresql.org>
Date: 2013-05-02T22:33:03Z
Releases: 9.3.0
Prevent (auto)vacuum from truncating first page of populated matview.

Per report from Fujii Masao, with regression test using his example.

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