Reset IC to premonomorphic rather than uninitialized.

R=mstarzinger@chromium.org

Review URL: https://chromiumcodereview.appspot.com/24512003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16936 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Remove obsolete global SubString method.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/24545002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16937 ce2b1a6d-e550-0410-aec6-3dcde31c8c00