ZWR: break up main() into sections
ZWR: break up main() into sections

git-svn-id: 13244e1f4c8acb548f3f909f1ae0d151defad92d@181 1ea6ab17-982b-0410-b0ab-91172c90a6e5

mikeash/MAZeroingWeakRef,mikeash/MAZeroingWeakRef