Allow smis for singleton types

To that end, introduce a generic Box struct.

R=danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16562003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14987 ce2b1a6d-e550-0410-aec6-3dcde31c8c00