In JSArray::pop(), the results of SparseArrayValueMap::find() (a SparseArrayValueMap::iterator) is compared against SparseArrayValueMap::end() (a SparseArrayValueMap::const_iterator). This fails to compile on some platforms. It should be compared against SparseArrayValueMap::notFound().
Committed r104355: <http://trac.webkit.org/changeset/104355>