#2185: bandage for 9.2 EDB x64 basically set all these SQL functions to have a cost of 1 (like the others) so they rarely will ever cache.  It's super sugar coating the issue -- there is something I feel wrong with our parser that it's properly cleaning on error and corrupting shared memory when things are cached. but at least regress.sql now passes under 9.2 edb 64

git-svn-id: http://svn.osgeo.org/postgis/trunk@11476 b70326c6-7e19-0410-871a-916f4a2858ee