Machine constraints list

[David Wohlferd]

On 5/9/2016 6:42 AM, Paul_Koning@Dell.com wrote:
>> On May 8, 2016, at 6:27 PM, David Wohlferd <dw@LimeGreenSocks.com> wrote:
>>
>> If these architectures aren't supported anymore, is it time to drop some of these from this page?
> Your theory is quite mistaken.  A lot of the ones you labeled "drop" are supported.  Quite possibly all of them.

Ok, I see that.  Spot checking some of the architectures, they are still 
getting periodic checkins.

In my defense, I can't find any official list of which are 'tertiary' 
and which are deprecated (https://gcc.gnu.org/ml/gcc/2016-03/msg00010.html).

That said, there are still a lot of entries on that machine constraint page.

How about if I re-organize the list similar to function attributes 
(https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html)?  Or at a 
minimum, add @anchors for each architecture so there are links?

dw