Perform the same dead code eliminations on "extra args" of method calls as we do for JMultiExpressions.  This change makes it possible for non-side-effect causing "extra args" to be pruned out.

Also added missing didChange = true tracking.

Review by: spoon (postmortem)


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@2236 8db76d5a-ed1c-0410-87a9-c151d255dfc7