Reviewed by ggaren.

        - http://bugzilla.opendarwin.org/show_bug.cgi?id=9234
          Implement $&, $' and $` replacement codes in String.prototype.replace

        Test: fast/js/string-replace-3.html

        * kjs/string_object.cpp:
        (substituteBackreferences): Added support for $& (matched substring),
        $` (everything preceding matched substring), $' (everything following
        matched substring) and 2-digit back references, and cleaned up a little.

LayoutTests:

        Reviewed by ggaren.

        - test for http://bugzilla.opendarwin.org/show_bug.cgi?id=9234
          Implement $&, $' and $` replacement codes in String.prototype.replace

        * fast/js/resources/string-replace-3.js: Added.
        * fast/js/string-replace-3-expected.txt: Added.
        * fast/js/string-replace-3.html: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@14705 268f45cc-cd09-0410-ab3c-d52691b4dbfc