Refactor some lsyscache routines to eliminate duplicate code and save

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

Commit: 066926dfbb49c7684bf51153c71634d05f1244ce
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-01-21T00:57:15Z
Releases: 8.3.0
Refactor some lsyscache routines to eliminate duplicate code and save
a couple of syscache lookups in make_pathkey_from_sortinfo().

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