Patch: mips gas reorg

[Eric Christopher]

> I'm not satisfied with the logic implemented here:

Grrr... a lot of these options should have been errors to have
concurrently.

> It results in silently ignoring the -mcpu switch if an isa is
> specified. E.g. '-mips4 -mcpu=r10000' produces code for r8000
> without a warning, which breaks backward compatibility.
> 
> A simple fix would be doing the check for -mcpu first, I did
> so in the appended patch.

Go ahead. 

-eric


-- 
I will not grease the monkey bars