The compiled_transitions flag was enabled for quite some time now and seems to work out quite well, so time has come to remove the obsolete code paths and remove the unused methods.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/18034024

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15922 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Implement correct OS and CC detection.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/20734002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15923 ce2b1a6d-e550-0410-aec6-3dcde31c8c00