Ensure that all details of the ARC algorithm are hidden within freelist.c.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: cc4f58f4cdf7c3534c3e08b5dcc0e545fe192be8
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-02-03T23:29:19Z
Releases: 8.1.0
Ensure that all details of the ARC algorithm are hidden within freelist.c.
This refactoring does not change any algorithms or data structures, just
remove visibility of the ARC datastructures from other source files.

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