a const variable can be deleted between its declaration and its
initialization.

This fixes issue 189:

  http://code.google.com/p/v8/issues/detail?id=189

Review URL: http://codereview.chromium.org/18660

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1127 ce2b1a6d-e550-0410-aec6-3dcde31c8c00