Implement IF NOT EXIST for CREATE INDEX.

Fujii Masao <fujii@postgresql.org>

Commit: 08309aaf74ee879699165ec8a2d53e56f2d2e947
Author: Fujii Masao <fujii@postgresql.org>
Date: 2014-11-06T09:48:33Z
Releases: 9.5.0
Implement IF NOT EXIST for CREATE INDEX.

Fabrízio de Royes Mello, reviewed by Marti Raudsepp, Adam Brightwell and me.

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