Rename various "freeze multixact" variables

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

Commit: 3451faaec81c8d19acdb243bfc22598c33ab074d
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2013-09-16T18:56:11Z
Releases: 9.3.1
Rename various "freeze multixact" variables

It seems to make more sense to use "cutoff multixact" terminology
throughout the backend code; "freeze" is associated with replacing of an
Xid with FrozenTransactionId, which is not what we do for MultiXactIds.

Andres Freund
Some adjustments by Álvaro Herrera

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