Initialize CodeStubInterfaceDescriptor in the constructor.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/553833002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23773 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Whitespace change for bootstrapping auto roll bot.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23774 ce2b1a6d-e550-0410-aec6-3dcde31c8c00