[wwwdocs] Changes for LTO and IPA, ver 2

[Gerald Pfeifer]

Hi Honza,

sorry for not being able to review the earlier version you had
sent in a timely manner.  This looks good (= please commit) once
you made the two changes Jonathan suggested and the ones below.

And impressive list of contributions!!

On Thu, 18 Feb 2016, Jan Hubicka wrote:
> +       <li><p>Linker plugin was extended to pass information about type of

"The linker plugin..."

> + 	  binary produced to GCC back-end (that can be also manually controlled

"to the GCC back end" (add an article, and omit the dash)

> + 	  properly confiugre code generator and support incremental

"configure"
"the code generator"

> + 	     <li>Linking by <code>ld -r</code> will result in object file

"in an object file" 

> + 	     This delays the actual linking to the time final binary is produced

"the final binary"

> + 	     and thus permits whole program optimization.  Linking such object
> + 	     file is however slower.

"such an object"

> + 	     <li>Linking by <code>gcc -r</code> will lead to link time optimization
> + 	     and produce final binary into the object file.  Linking such object
> + 	     file is fast but avoids any benefirts from whole program optimization.</li>

I believe it's "linking with" (also in other cases).

And I'm not sure, "produce final binary into the object file" feels
a little odd.

"such an object file" or "such object files"?

"benefits"

Gerald