Foundation for the use of informative definitions in Crankshaft.

Review URL: https://codereview.chromium.org/12090021

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@13543 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'v8/bleeding_edge' into hj-dev-palfia