"dead" and "osr" block flags added to trace output for unreachable and osr entry blocks respectively.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/135943004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18550 ce2b1a6d-e550-0410-aec6-3dcde31c8c00