Reviewed by Kevin.

    Reviewed by Kevin.

        - fix crashes in mozilla tests due to mishandling NaN

        * kjs/array_object.cpp: (ArrayProtoFuncImp::call): Rerranged range checks after
        calls to toInteger so that NaN will get turned into something that fits in an integer.
        These were the ones John already fixed, but his fix used isnan and the new fix is
        more efficient.

        * kjs/number_object.cpp: (NumberProtoFuncImp::call): Rearranged radix range checks
        after a call to toInteger to handle NaN properly. Also removed separate check
        for undefined that's not needed.

        * kjs/string_object.cpp: (StringProtoFuncImp::call): More of the same kinds of changes
        as in the above two files, but for a lot more functions. Also changed one place with
        an explicit check for undefined to instead just check isNaN.

        * tests/mozilla/run-mozilla-tests: Changed to invoke jst using $SYMROOTS for people
        like me who don't keep $SYMROOTS in their $PATH.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@7171 268f45cc-cd09-0410-ab3c-d52691b4dbfc