Remove non-trivial subtyping between bitset and non-bitset types.

R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/444503005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22903 ce2b1a6d-e550-0410-aec6-3dcde31c8c00