[wwwdocs] Mention function reordering

[Ralf Wildenhues]

Hi Jan,

a couple of nits:

* Jan Hubicka wrote on Fri, Jan 07, 2011 at 07:03:16PM CET:
> --- changes.html	27 Nov 2010 10:26:28 -0000	1.73
> +++ changes.html	7 Jan 2011 17:59:35 -0000

> @@ -136,6 +136,19 @@
>              Unlikely executed functions are optimized for size.  Functions
>              executed once are optimized for size except for the inner
>              loops.</li>
> +	  <li>On most targets with named section support the functions used only

s/support the/support,/

> +	    at startup (static constructors and <code>main</code>), functions used
> +	    only at exit and functions detected to be cold are placed into separate
> +	    text segment subsections.
> +	    This extends <code>-freorder-functions</code> feature and is

s/extends/& the/

> +	    controlled by the same switch. The goal is to improve startup time of large

the startup time

> +	    C++ programs.
> +	    <p>Proper function placement require linker support.

requires

> +	    GNU ld 2.21.51 on ELF targets was updated to place
> +	    those functions together within the text section leading to better code
> +	    locality and faster startup times of large C++ programs. Support in gold

the gold linker

> +	    linker is planned.</p>
> +	    </li>
>        </ul>
>        </li>
>        <li>A new switch <code>-fstack-usage</code> has been added.  It makes

Cheers,
Ralf