Cosmetic improvements to freeze map code.

Robert Haas <rhaas@postgresql.org>

Commit: fdfaccfa798c1c9993feae1fac6e0f79d72aa7b7
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-06-03T12:43:41Z
Releases: 9.6.0
Cosmetic improvements to freeze map code.

Per post-commit review comments from Andres Freund, improve variable
names, comments, and in one place, slightly improve the code structure.

Masahiko Sawada

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