Just wanted to add two constructors to a datatype, how ugly can it get?

R=bmeurer@chromium.org, jarin@chromium.org
BUG=

Review URL: https://codereview.chromium.org/228263005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20809 ce2b1a6d-e550-0410-aec6-3dcde31c8c00