REGRESSION: for/in loop with var changes global variable instead of making local

        * fast/js/for-in-var-scope.html: Added.
        * fast/js/resources/for-in-var-scope.js: Added.
        * fast/js/for-in-var-scope-expected.txt: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@12565 268f45cc-cd09-0410-ab3c-d52691b4dbfc