Map::TransitionElementsTo() extracted from JSObject::GetElementsTransitionMap().

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/260803002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21138 ce2b1a6d-e550-0410-aec6-3dcde31c8c00