RFR: 8223186: HotSpot compile warnings from GCC 9

[Arthur Eubanks]

Looks good to me. This also fixes the Clang build on Linux. Thanks!

*From: *Yasumasa Suenaga <yasuenag at gmail.com>
*Date: *Thu, May 9, 2019 at 7:20 PM
*To: *David Holmes
*Cc: *HotSpot Open Source Developers

Thanks David!
> I'm waiting for second reviewer.
>
>
> Yasumasa
>
> 2019年5月10日(金) 11:14 David Holmes <david.holmes at oracle.com>:
> >
> > Hi Yasumasa,
> >
> > This all looks fine to me.
> >
> > Thanks,
> > David
> >
> > On 2/05/2019 12:03 pm, Yasumasa Suenaga wrote:
> > > Hi all,
> > >
> > > Please review this change:
> > >
> > >    JBS: https://bugs.openjdk.java.net/browse/JDK-8223186
> > >    webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8223186/webrev.00/
> > >
> > >
> > > I saw following warnings when I compiled HotSpot with GCC 9 on Fedora
> 30
> > > due to -Wwrite-strings, -Wstringop-truncation and -Wclass-memaccess.
> > > I filed all warnings to JBS.
> > >
> > >
> > > Thanks,
> > >
> > > Yasumasa
>