Fixing a bug where a try-finally block obscured a try-catch block when registering an external try-catch handler.
Review URL: http://codereview.chromium.org/13658

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@945 ce2b1a6d-e550-0410-aec6-3dcde31c8c00