* Be more var-correct in JS files.
* Rename some JS variables to reflect the fact that they are instance
  variables on the global intrinsics object.
* Missing optimization in StringCharAt.
Review URL: http://codereview.chromium.org/215052

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2959 ce2b1a6d-e550-0410-aec6-3dcde31c8c00