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[Patch wwwdocs] gcc-5/changes.html : Document AMD monitorx and mwaitx


Hi Gerald,

This patch documents about  AMD instructions "mwaitx" and "monitorx" in GCC- 5 changes.html.
Please let me know if this ok to commit? 

Index: htdocs/gcc-5/changes.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-5/changes.html,v
retrieving revision 1.121
diff -r1.121 changes.html
810a811,819
> 	<li>Support for new AMD instructions <code>monitorx</code> and
> 	<code>mwaitx</code> has been added. This includes new intrinsic
> 	and built-in support. It is enabled through option <code>-mmwaitx</code>.
> 	The instructions <code>monitorx</code> and <code>mwaitx</code>
> 	implement the same functionality as the old <code>monitor</code>
> 	and <code>mwait</code> instructions. In addition <code>mwaitx</code>
> 	adds a configurable timer. The timer value is received as third 
> 	argument and stored in register <code>%ebx</code>. GCC 5.2 is the 
> 	first release to support these instructions.</li>

I will send another patch for trunk as well.

Regards,
Venkat.


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