Reviewed by Darin.

    Reviewed by Darin.

        - fixed "toPrecision sometimes messes up the last digit on intel Macs"
        http://bugzilla.opendarwin.org/show_bug.cgi?id=7748

        * kjs/number_object.cpp:
        (intPow10): Compute integer powers of 10 using exponentiation by squaring.
        (NumberProtoFunc::callAsFunction): Use intPow10(n) in place of all pow(10.0, n),
        plus a bit of refactoring.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@13676 268f45cc-cd09-0410-ab3c-d52691b4dbfc