Enable harmony_typed_arrays for shared build of d8.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/14927014

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14648 ce2b1a6d-e550-0410-aec6-3dcde31c8c00