Rewrote to the mechanism for invoking the callbacks for lexical scoping to not suck as much as before, i.e. it is somewhat less inefficient
adapt to filter instance key changes
bug fixes to IR generation for switch statements
git-svn-id: https://wala.svn.sourceforge.net/svnroot/wala/trunk@839 f5eafffb-2e1d-0410-98e4-8ec43c5233c4