Patch for PR 18027 (IA-64 documentation)

[Mark Mitchell]

Steve Ellcey wrote:
> PR 18027 mentions several undocumented options on IA-64.  This patch
> adds all the missing options that I found for IA-64 to invoke.texi.
> 
> For the HP-UX specific options, I just added a line in the description
> that they are only recognized on HP-UX.  I don't know if there is a more
> formal way to do this.
> 
> OK for checkin?  Should this be checked in on the 3.4 branch as well?
> The options all exist in 3.4.*.

OK for 3.4 and mainline.

-- 
Mark Mitchell
CodeSourcery, LLC
mark@codesourcery.com
(916) 791-8304