Rename "OptimizingCompiler" to the more suitable "RecompileJob".

R=mvstanton@chromium.org
BUG=

Review URL: https://codereview.chromium.org/24543002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16939 ce2b1a6d-e550-0410-aec6-3dcde31c8c00