Add PowerPC64 ld --tls-get-addr-optimize

[Alan Modra]

On Mon, Sep 21, 2015 at 10:51:25AM +0200, Andreas Schwab wrote:
> > +@cindex PowerPC64 __tls_get_addr optimization
> > +@kindex --tls-get-addr-optimize
> > +@kindex --no-tls-get-addr-optimize
> > +@item --tls-get-addr-optimize, --no-tls-get-addr-optimize
> 
> Please split the @item instead of putting both options on the same line.

Did I violate some standard?  If so, I have a few more to fix..

-- 
Alan Modra
Australia Development Lab, IBM