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

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

Commit: c8460d571e72c47c3a82f74b16d6b4d81154049f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-02-03T23:30:12Z
Releases: 8.0.2
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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