The IterateThreads method only iterates archived threads. If all
threads are to be iterated an additional iteration of the current active
stack is also needed.


Review URL: http://codereview.chromium.org/2655002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4798 ce2b1a6d-e550-0410-aec6-3dcde31c8c00