Simplify parse representation of savepoint commands

Peter Eisentraut <peter_e@gmx.net>

Commit: ec87efde8dbc670467468860c5d577dc805dae5e
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2018-03-16T17:18:06Z
Releases: 11.0
Simplify parse representation of savepoint commands

Instead of embedding the savepoint name in a list and then requiring
complex code to unpack it, just add another struct field to store it
directly.

Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>

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