Revert "Fix compilation with C++11." and "Allocation site support for monomorphic StringAdds in BinaryOps.".

This reverts commit r18431 and r18432 for breaking
the Linux nosnapshot build.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/122463004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18434 ce2b1a6d-e550-0410-aec6-3dcde31c8c00